M40S Series
H M 0 2 0 G I
H M 0 4 0 H I
H M 0 6 0 I I
H M 0 8 0 J I
Model:
manual
HARD DISK DRIVE service
H a r d D i s k D r i v e
Contents
1. Specification summary
2. Block Diagram of HDD
3. Connector & Jumper Pin Assignments
4. How to check if HDD is working
5. Exploded View
6. Maintenance Cylinder Configuration
7. How to use HUTIL Program
8. How to progress Burn-In Test
9. Caution
Attachment 1. The basic information
related HDD
Attachment 2. HDD related terms
Attachment 3. Q&A
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
2. Block Diagram of HDD
PREAMP &
READ/WRITE
CHANNEL IC
WRITE DRIVER
Marvell
Marvell 88C6590
G214M
HDA
A
T
A
CUSTOMIZED IC including
AT CONTROLLER, EMBEDDED
SERVO CONTROLLER, DSP
PROCESSOR, ADC & DAC
Dual-DSP 88I6525
SPINDLE MOTOR &
ACTUATOR COMBO
DRIVER
B
U
S
TLS2502
Internal Flash Ron
1.5Mbit
Buffer 64Mbit
K4S641632H-UC60
HDD
HDA (HEAD DISK ASSEMBLY)
PCBA (PCB ASSEMBLY)
- PCBA
- HEAD
- DISK
- VCM (Voice Coil Motor)
- SPM (Spindle Motor)
3
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
입력
5V
5V
SPINDLE MOTOR &
ACTUATOR COMBO
DRIVER
Buffer
64Mbit
3.3V
FET
TLS2502
K4S64163
2H-UC60
-3V
1.2V
Channel IC &
HDC
88i6525
18pin Connector
4
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
3. Connector / Jumper Pin Assignment
●
Serial Connector Interface Signals
Pin
Function
Ground
Rx+
Definition
Data
Signal
S1
S2
S3
S4
S5
S6
S7
Ground
Differential Signal Pair
Differential Signal Pair
Ground
Connection
Rx-
Ground
Tx+
Differential Signal Pair
Differential Signal Pair
Ground
Tx-
Ground
Key and Spacing separate
signal and power segment.
Power
P1
P2
V33
V33
3.3V
Management
3.3V
P3
V33
3.3V
P4
Ground
Ground
Ground
V5
Ground
Ground
Ground
5V
P5
P6
P7
P8
V5
5V
P9
V5
5V
P10
P11
Ground
Ground
Device Activity/Stagger Spin-up
control
This pin was reserved in
SATA 1.0a
P12
P13
P14
P15
Ground
V12
Ground
12V
V12
12V
V12
12V
●
BIOS Setup Parameter
Model
CYL
HD
PRE
LZ
SEC
SIZE
Remarks(LBA)
39,179,952
HM020GI
HM040HI
HM060II
HM080JI
38,869
77,622
16
16
16
16
X
X
X
X
X
X
X
X
63
63
63
63
20 GB
40 GB
60 GB
80 GB
78,242,976
116,374
155,127
117,304,992
156,368,016
5
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
4. Exploded View
6
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
<< Major components of HDD >>
HDD is formed by major components as follows: Base, Cover, ARM(E-Block), Latch, Crash Stop,
Pivot Bearing, Breather Filter, Window Clock, Window Push Pin, Jump Pin, Spindle Motor,
Actuator, Magnetic Head, Magnetic Disk, PCBA
1 Base
Base could be a basic frames for HDD assembly. Spindle motor, ARM, VCM, cover and PCBA
are assembled on it, and other components are sub-assembled on those configuration.
ARM and Spindle motor assembled to Head and Disk each in advance,then those are assembled
on Base. If base could be effected by external and internal vibration (spindle motor
& actuator's fake vibration), relative displacement occurred between head and disk so to
reduce this effect to PES(Position Error Signal) and data signal, shape design concerned
mode shaping should be needed.
2 Cover
Cover protect HDD components from the exterior impact and play role of sealing to cut off
particle and moisture which could be a fatal factor to head and disk. Cover is also designed
in consideration of noise and vibration effect.
3 ARM (E-block)
ARM is assembled HGA and VCM coil back and forth and it is connected to pivot axis pivot
bearing. When VCM coil generate torque due to electromagnetic force of VCM, ARM swing around
pivot and play a role of carriage so as head may access to information side of disk.
Inertia: It is the best way to shorten data access time that shows how fast head can
reach to the proper point on of HDD efficiency, is minimizing ARM's weight to decrease inertia.
And then to decrease weight of ARM, it'll be composed low density materials and reduce ARM's
size within safety allowed when designed.
Unbalance: If the center of gravity for ARM isn't the same with that of pivot center,
unbalance occur and it caused ARM to torque.
And acceleration might affect on unbalance mass in condition impact or vibration are given
from the exterior. In case of magnetic latch, this unbalance could be a reason that latch
released. Therefore shape simulation of ARM should be designed lest the center of gravity
should go off center of revolving.
4 Latch
When power HDD off, spindle motor stop spinning and park on the ramp automatically
according to the order systemized. By that time if head is given any impact or vibration
from the exterior, head invade data zone clung to disk. And then data damaged consequently,
Latch solve the problem above as latch makes head maintain to be putted on the ramp from
external shock.
5 Crash Stop
Crash stop is made of elastic material and weaken a impact of actuator in emergency condition,
head getting out of data zone when it move to parking zone or seek.
7
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
6 Pivot Bearing
Pivot bearing is a roll bearing fixed the center of gyration of ARM. Inner Race is fixed by
screw after being connected to Base pivot and outer Race is fixed by retaining ring after
being connected by ARM's hole and make the ARM's revolving movement actively.
7 Breather Filter
In the interior of HDD, air flow is formed by the spinning disk in high speed and pressure
distribution occurred. This pressure is lower than atmospheric pressure of the exterior of
HDD and due to this, the outside air inflow into the interior caused contamination.
Breather filter fixed in inflow plug induce clean air and help air circulation.
8 Window Clock
Head must know the data's location information to access data on disk. Servo write is
a process of recording information disk. To record information, we make hole that head
for servo write can enter the interior of HDD and this hole is window clock.
This hole is closed with sealing label after done servo writing, be careful not to be
occurred inner contamination due to label's injury.
9 Window Push Pin
Head should be controlled to move on disk at a regular track pitch interval rate during
servo writing. ARM is torqued by VCM continuously and was controlled each track's moving
using push pin. Window push pin is a hole for this, the pin could enter interior of HDA
and be careful contamination caused by label's injury because this hole is closed by sealing
label after done servo writing.
10 Jump Pin
During installing, HDD need setting of pin organization in the next according to
the drive running mode: master drive in single system, master drive in dual system,
slave drive in dual system.
11 Spindle Motor
Spindle motor is a sort of small motor which can change electric energy to mechanical energy
utilizing for magnetic field. When the current of stator's coil formed by electromagnet
is on, magnetic power occur between stator and rotator. (repeal occur between same pole and
attract occur in case of different pole) This power can make rotator revolve and we should
keep on changing the magnetic pole of the stator to maintain rotate at regular speed.
To progress this function, we deduct rotation speed and circuit for controlling needed.
It is possible to control the current flow and time interval with Hall element and MR
element (these are sensitive to voltage change). The magnetic disk of hard disk is running
by DC Brushless direct drive motor directly. Brush has long life and high reliability
because it doesn't have belt. Recently we use flat motor to be adopted to the request of
minimizing. The rotation bearing is supported by Fluid Dynamic Bearing(FDB), this is not
keeping high speed spinning but also reducing resistance even eliminating and this make the
acceleration better.
The life of hard disk is up to the durability of this bearing supporting revolving axis.
Spindle motor rotate a disk media at regular speed.This device start to rotate as soon as
8
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
put power on and no matter what HDD read or write data,spindle motor always revolve.
Besides accurate reading from the media point of view is possible when maintain the constant
speed within 0.1%,rotation error. The control circuit of spindle motor receive the index data
from the spindle motor or media at every spin and check whether constant speed persists or not
then revise the speed. Spindle motor is applied to DC brushless motor.
12 Actuator
Hard disk has 2 disks so it has 4 written sides, and each side needs each written replay
device, 8 heads needed. This 4 heads can't work independently. Each head is connected with
one carriage and set as running altogether. For example, one head move at tenth track and
then the rest come to move at the same track. Retrieval(information searching) is a moving
the head to track properly. The faster searching speed, the better for a quick access.
It is profitable to use voice coil motor for a fast searching speed. Making narrow
the width and interval of track is for HDD capacity improvement so we can build more tracks
on written side so searching movements in head become subtle. Therefore servo control the
decision of HDD location. Magnetic disk is put standard signal for location marking from the
manufacturing step. Head read this to find the relative difference then run motor mediate
the head's location.
13 Magnetic Head
Magnetic field is formed around the conduct on passing electric current to conductor and
the direction and size of magnetic field are decided by those of an electric current.
Magnetic head build a minute gap in core (formed by ring) and pass an electric current then
strong magnetic leakage are occurred around gap thus magnetic particles of media vary the
direction according to the that of current: this is called recording. On the contrary, a
process induce magnetic signal to electric signal is called reading(decipherment).
14. Magnetic Disk
Recording carrier become a permanent magnet according to applying magnetic material to the
surface and change the magnetization direction of a electromagnet and it is possible to
store information during long term.
15. PCBA
PCBA is a circuit element concerning about HDD running and constructed in
engine IC,COMBO IC,read/write IC,ROM ,and sort of chip etc.
- Engine IC: contained RAM&Interface IC and exchange information to computer.
- COMBO IC: Controlling spindle motor & VCM running when HDD power on.
- Read/Write IC: read/write of HDD
- ROM: Checking HDD basic function and management basic spec.
16. Ramp
2.5 inch drives usually adopt Load /Unload ramp system to prevent head slap for disk basically.
Head is putted safely on the ramp which is located off disk-outer diameter at non-operating
It makes head avoid to slap disk during the external shock. and play a major role to move to
disk smoothly at loading and move smoothly and safely to itself to park head at power-off.
9
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
6. Maintenance Cylinder Configuration
File Name
Cyl Sector
Size
Ref ID
Descriptions
FSI
0
1
1
File System Information record
Backup copy of FSI
File Information Table
Backup copy of FIT
Maintenance Cylinder Defect List
Servo Table
FSI2
FIT
0
2
4
FIT2
MLIST
0
0
6
7
1
4
M_LIST
SV_TBL
SVOTBL
CONFIG2
CONFIG
SERNUM
BISCRT
BIRSLT
CONFIG2
CONFIG
SERIALNO
BI_SCRPT
BI_RESLT
BI_CRTRA
FNL_TEST
CHN_TBL
GEO_TBL
VLIST_H
VLIST
0
12
1
2
System Configuration Data
System Configuration Data
Serial Number
1
2
1
3
2
1
5
4
Burn-In Script
1
10
11
12
30
46
78
79
111
1
1
Burn-In Result
1
1
CRITER
FNLTST
CHTBL0
GEOTBL
VLSTHD
V_LIST
Burn-In Criteria
1
8
Final Test
1
12
32
1
Channel Table
1
Drive Geometry Table
Servo Defect List header
Servo Defect List
1
1
12
1
SLIST_H
SLIST
1
SLSTHD
S_LIST
Slip Sector List Header
Slip sector list
6
512
8
TLIST
1
364
801
385
381
382
383
387
401
148
59
60
61
62
72
82
550
1
T_LIST
Track Defect List
RLIST
1
35
1
R_LIST
Reassign List
TMPRTURE
SET_MAX
SECURITY
SV_TBL2
CHN_TB2
OVERLAY
BI_TIME
ER_CNT
SV_ERCNT
SCN_GRAY
PAR_MON
WK_HEAD
TPI_WRW
MR_TUNE
DLIST
1
TMPREC
SETMAX
SECUTY
SVBKUP
CHTBL1
OVRLAY
BITIME
Temperature Measurement Data
Set max LBA number
Security data
1
1
1
1
1
3
Servo table backup
Channel table backup
Overlay firmware code
Burn-In test time
1
8
1
396
3
4
4
1
ERRCNT
SVECNT
SCNGRY
PARMON
WKHEAD
TPIWRW
MRTUNE
D_LIST
Burn-in error count
Burn-in servo error count
Scan gray data
4
1
4
1
4
10
10
4
Burn-in channel parameter monitor
Weak head data
4
4
Burnin TPI measurement data
MR head tune data
Primary defect list
Geometry table for test/select TPI/BPI
Smart data
4
40
768
384
9
5
TST_GEO
SMRT
24
11
11
11
11
11
1
TSTGEO
SMRTBL
SMRTLG
SMRTWT
SMTHLG
BIASHK
1
SMRT_LOG
SMRT_WTS
SMRT_HLG
BIAS_SHK
END-FIT
3
4
Smart log
10
15
526
5
Smart write test
512
370
Smart host log
Bias shock data
End of Record
10
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
※
Explanation of terms for HDD repairing
CONTENTS
SYMPTOMS
Motor doesn't drive.
When HDD power on, LED is in on and motor
Led is still on/off mode when power on
: PCB failure
NOT READY
(NR)
start to drive. At this time head make
vibration and start to drive then stop the
vibration and led is off at the same time.
Led is still in on mode and doesn't
make any vibration.
DISK DEFECT Symptoms for damage at disk side
ID,MD,OD failure is occurred in
leo test process rate 0 ~ 33% OD
34~ 66% MD
ID
Defect is occurred at the inner part of disk
Defect is occurred at the middle part of disk
Defect is occurred at the out part of disk
MD
OD
67~100% ID
MAINTENANC
Part of basic information like defect etc. in
HDD
E
CYLINDER
Maintenance cylinder defect
DEFECT(MC)
SPIN MOTOR Motor rotate disk and if it is impacted ,make a When power on, some irregular noise is
NOISE(SM)
big noise due to damage.
occurred at general motor.
how many times does it cost to progress read
test in leo actually
ERASED TIME
This is SUFFECTED in drive
NORMAL TIME Prescribed read test time by product company.
Read and defect free are progressed
AUTO TEST
automatically.
ALT+A Key
Transfer defect on disk into buffer cylinder on OD,MD,ID is occurred when defect free error
DEFECT FREE disk. Defect isn't available for read/
and exceed the capacity to progress defect
write
free. F6 Key
F2 Key
READ TEST
WRITE TEST
DELETE
Read wether damage on the disk side or not
Write the regular data on disk side.
Erase all the previous Data entirely at leo test
pass product.
F4 Key
F7 Key
SYSTEM
HEAD is located at cylinder of disk correctly
and is tested write ,read is available.
PES
HUTIL test PES fail
Product which CD,MD,ID defect is occurred in
HUTIL test is downloaded(head test)by ALT-I
and if it is passed ,only power on
Repeat read,write for with many hours and
progress defect free finally for the product
confidence.
BURN IN
TEST
needed.Repeat led once is pass, fail when
fail happen once more.
To check defect of HDD, svc tool,
read,write,head,pes are manufactured to test
Check menu with F10 Key.
HUTIL TEST
defect and this is available for defect free and Refer to HUTIL manual for usage
other variable test.
11
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
7. How to use HUTIL Program
1) Before you start
HUTIL support from Voyager11P to PALO series.(HUTIL 1.12 version)
(HUTIL has been upgrading constantly whenever new model comes out.)
- Preparation before use
Diskette or HDD containing HUTIL.EXE should be boot-up to MS-DOS mode,that is,
should be contained IO.SYS, MSDOS.SYS,COMMAND.COM (IO.SYS, MSDOS.SYS: hidden file).
And also HUTIL.CFG is required.
2) Explanation of each menu
[TEST]
SHORT TEST
Menu for random read test, no defect free test.
LONG TEST
Read test from the first cylinder to the last in order,
no defect free test.
READ ALL
Display error list when error is occurred after reading whole cylinder.
Message will be appeared if the test time delay is over 20 seconds compared
with other normal HDD. In this case, HDD may have problem. (Progress
sequential read test from cyl. #0 to the last cylinder. No Defect Free.
- Refer to attachment below.)
READ FROM TO
Read from the designated cylinder and head to the designated cylinder.
Press ESC to stop in the middle.
WRITE ALL
Write 00h on all cylinder except maintenance cylinder.
All data will be removed. (Even partition table, boot sector & FAT)
WRITE FROM TO
Write from the designate cylinder and head to the designated cylinder.
DEFECT FREE
Progress after
command.
Read Drive
Defect free operation for the defects in the error list.
LONG TEST & DF
뭉
Current auto test.Check defect and defect free during read test
examine defect free again.
12
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
BURN IN
Download burn-In script to HDD.
ERASE & SCAN
Write full surface with 00 pattern and scan full surface.
OD SCRATCH TEST
Check OD for OS area has physical problem.
AV SCAN TEST
scan full surface every 256 Sectors and check elapsed time.
[INFORMATION]
NEW DEFECT LIST
View the error list in memory.
NEW DEFECT MAP
Show defect on drive in graphic mode. These defects are
invisible because of done then these are added after defect
free done B/I & Read test or Auto test separately.
GROWN DEFECT MAP
Show the defects in graphic mode during HUTIL program.
Moving along cursor with up/down arrow key, these keys
are indicated the location of defects in the right list
on disk. This location is agreed with the real location
because skew was concerned in that already.
The color of an arrow is agreed with those of head in
which defect occurred.
※
This function is applying to Voyager10,11,11P currently and this function can't show the
defects during process.
[TOOL]
SET MAX ADDRESS
Control Drive's Max Address
a) PROCESS
Change Max Address to designated size.
b) TARGET LBA
Set Max Address size with LBA.
c) TARGET SIZE
Set Max Address size with MB
d) MODE [NON-VOLATILE, VOLATILE]
Decide Changed Max Address is permanent or volatile
e) RECOVER NATIVE SIZE
Recover to original size
f) DISPLAY CURRENT STATUS
Show Current Size and Original size
13
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
DCO SET MAX ADDRESS
Control Max Address with DCO Command.
a) PROCESS
Change Max Address to designated size..
b) TARGET LBA
Set Max Address size with LBA.
c) TARGET SIZE
Set Max Address size with MB
d) RECOVER NATIVE SIZE
Recover to original size
e) DISPLAY CURRENT STATUS
Show Current Size and Original size
C. ERASE HDD
Erase all data in Drive. Write with 00 pattern
a) PROCESS
Execute Erase Drive
b) TARGET LBA
Set Erase size with LBA
c) TARGET SIZE
Set Erase size with MB.
d) ERASE MBR
Erase M.B.R. (LBA 0).
e) LOW LEVEL FORMAT
Erase full surface faster with VU Command.
D. SET MAX UDMA MODE
Control UDMA limit
a) PROCESS
Change designated speed
b) UDMA MODE [UDMA 33, UDMA 66, UDMA 100, UDMA 133, SATA 150]
Support mode depends on drive model.
c) DISPLAY CURRENT MODE
Show Current max UDMA mode
※
If setmax is already set on drive, we can't use this function.
E. AUTOMATIC ACOUSTIC MANAGEMENT
Change AAM mode
a) PROCESS
Change designated speed
b) AAM MODE [DISABLE, FAST, MIDDLE, QUIET]
Support mode depends on drive model
c) DISPLAY CURRENT MODE
Show Current AAM mode
14
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
F. SELF DIAGNOSTIC
diagnostic for end user
G. CHANGE NATIVE SIZE
Control Drive size with VU Set Max Command
a) CHANGE NATIVE SIZE
Change Native Size as designated.
b) TARGET LBA
Set Native Size with LBA
c) F/W REVISION
Change Firmware revision except first 2 charactor.
d) MODEL NAME
Change model name, 'SAMSUNG' should be on model name,
because hutil uses model name it is samsung drive or not.
e) RECOVER ORIGINAL SIZE
Recover to original Native Size.
f) DISPLAY CURRENT STATUS
Show Current native size and original native size.
H. SET SECURITY
Control Set Security
a) SET SECURITY UNLOCK : SECURITY UNLOCK.
Drive is unlocked during drive power is on. after power off, drive will be
locked again.
b) SET SECURITY DISABLE : SECURITY UNLOCK & DISABLE.
Drive is unlocked permanently.
c) SET SECURITY PASSWORD
Lock drive with designated Password.
d) PASSWD : Password
e) IDENTIFIER : USER/MASTER
f) LEVEL : HIGH/MAXIMUM
I. VENDOR UNIQUE SET SECURITY
Unlock drive without user password.
a) VU SET SECURITY UNLOCK : SECURITY UNLOCK.
Drive is unlocked during drive power is on. after power off, drive will be
locked again.
b) VU SET SECURITY DISABLE : SECURITY UNLOCK & DISABLE.
Drive is unlocked permanently.
c) VU SET SECURITY PASSWORD :
Lock drive with original password
J. 48BIT LBA SUPPORT
Change drive 48bit lba on/off
[OPTION]
ABOUT HUTIL
15
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
Version of HUTIL.
DOS SHELL
Execute DOS Shell. If you want back to HUTIL, input EXIT.
DRIVE INFORMATION
Open the information window about the target HDD.
Press to close.
ESC
EXIT TO DOS
End HUTIL program.
3) The others
- Difference of read test and auto test
(Difference from HUTIL user, refer to supplement )
①
How to Read All/From Test: In "read all test" case, only show error status on screen not to
progress D/F(defect free) but to read. This method is available for test
in case of lots of set because we can save D/F time if defects are
occurred.
※
In case of S/C in Europe(All-in), progress the test by using read test(F2).
First, progress "all read" and if defect is occurred during progress, decide failure or
B/I judgment quickly to select set promptly in state fail limit and B/I limit are decided
according to defect numbers. This progress is available for test in case of lots of set.
A weak point is that limit is hard to be decided because LED user judge "pass" or B/I
"failure" for himself.
※
Pass standard of EDC in case of S/C in Europe(All-in)
⇒
⇒
⇒
⇒
: Progress test
- Standard of B/I test: Progress test
judge B/I test after B/I down loading.
defects are occurred no more than 0 ~ 4
progress D/F
judge "pass".
⇒
defect is occurred less than 5 ~ 200
⇒
⇒
- Failure standard: Progress test
defect is occurred more than 200
failure
(little bit differ from real case because the standard is a example which HUTIL
user progress the test after data analysis.)
②
→
→
→
media check
How to Short/ Long Test : Head check
PES check
M/C check
If defect is occurred during media test,progress D/F keeping on test progress.
In case of Auto test, failure code is appeared on screen so failure is judged commonly.
It takes lots of times because defect is progressed whenever error occurred.
※
Two methods above have weak and strong point both, so apply these to proper condition.
(Auto test)
- Standard of failure judgment
①
Head Check
ⓐ
Write Head: All heads are progressed to write at the last cylinder (ID region).
If it is fail to write due to cylinder error, progress again in the next inner
cylinder. Record failure status to the corresponding head after progress error
check to all 10
→
→
Pass ... )
cylinders.( e.g.: Head 0
Fail, Head 1
ⓑ
→
remark "failure" if error occurred in
Read Head: Seek 100 cylinders per OD, MD, ID regions
16
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
3 times per region. ( Judge failure by reading not the whole cylinder but
servo sector only because it is apt to mistake failure to head failure due to
scratch)
②
PES Check (PES, RCO, Mechanism)
: Compare PES value from the first cylinder starting OD(except MC ),MD,ID region to the 3rd
→
cylinder. (Check 30 times per 1 cylinder)
3 times per 1 cylinder.
Remark "failure" when error occurred more than
③
Maintenance Cylinder Check(M/C): Read Maintenance cylinder from the number of 0 to the last.
In case of "MC", remark "failure" when error happened in one time.
→
④
Media Check
: Read from OD to ID region same as the existing read test function and progress "D/F"
whenever defect occurred.
ⓐ
Auto Defect Free: Reading along OD to ID region, progress "D/F" promptly if defect occurred.
Read the next sector if no defect occurred and progress D/F if defect occurred.
When we don't have any more cylinder space for D/F, stop progressing D/F and then remark
defect status for the next 30 defects occurred from the D/F stopping location.
Remark failure:
ⓑ
- If the number of defects are same in OD,MD,ID region
→
remark failure in order of OD > MD > ID.
- If the number of defects are different in OD,MD,ID region
→
remark failure in region have the most defects among OD,MD,ID region
□□
continuousness: Continuous scratch more than 15 cylinders
divergence: Divergent scratch less than 15 cylinders
□□
⑤
Test OK: Remark "Test OK" if no problem occurred when test done.
If it passed due to D/F, remark "Defect free by pass~" and show the corresponding
failure region in the below. At this time, input the code of failure region shown
and the control code 'is a "Defect controlled".
※
Display Read time with checking during Read test,
(Stop reading if expecting read time exceeded +10 when 50 % tested.)
4) HUTIL Error message
①
Error messages
- ECC ERROR: Where the data was written (data writing dimension in sector, data zone)
occur physical damage (hard related error: disk ding by head caused by impact
and vibration) or logical damage. (soft related error: error is occurred during
writing) Logical error(damage) could be cured by re-writing.
- DATA AM NOT FOUND ERROR: Damaged address mark(AM:current address information of data)
among the structure of sectors, containing the logical and physical
defect.
- ABORTED COMMAND: Message when HDD can't recognize the fixed order in program.
(PCBA failure or HDA failure.)
17
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
②
Example of disk failure
< Error List >
CYL
1
HD(Head)
SEC
117
106
110
12
Error List
ECC Err
0
1
1
2
1
2
3
1
1
3
1
2
2
1
2
Data Am Not Found
ECC Err
3
4
ECC Err
117
120
159
170
171
172
173
174
190
191
13
ECC Err
152
102
ECC Err
ECC Err
Most of case,defects(cylinder)are sporadic or continuous but if defects are partly -continuous,
disk could be judged disk failure.
It is called the continuous defects "scratch" it means that head is scratched the disk side
in the direction of arc or straight due to impact or vibration after motor run.
18
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
③
Example for Head related failure
< Error List >
CYL
1
HD(Head)
SEC
117
106
110
12
Error
1
ECC Err
2
1
Data Am Not Found
ECC Err
3
1
4
1
ECC Err
5
1
1
1
1
1
1
1
1
1
1
13
ECC Err
6
152
102
ECC Err
7
ECC Err
8
9
10
11
12
13
14
Compared with disk failure,head related failure occur in particular HD(head) from the first
cylinder and this is occurred continuously.(it is occurred in two more heads)
If failure is continuous, we are confused if it is head failure or disk failure. At this time
read the edge of cylinder again then it is head failure if error still be continuous at the
particular head and disk failure in sporadic case. And failure occurred with changing cylinder
and head continuously, it is called assembly failure in inner HDA or caused from other problem.
(HDA related failure )
< Error List >
CYL
1
HD(Head)
SEC
Error
1
2
3
4
1
2
3
4
1
2
3
4
1
2
117
ECC Err
1
106
110
12
Data Am Not Found
ECC Err
1
1
ECC Err
2
13
ECC Err
2
152
102
ECC Err
2
ECC Err
2
3
3
3
3
4
4
19
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
HUTIL Test Flow/Error Code
Codes marked as red among broken codes are displaying automatically in HUTIL Program!
Label error
[AJ44]
[AJ45]
[AJ12]
[AJ13]
[AJ32]
Label damaged
PCBA burnt
PCBA ERROR
HDA ERROR
N>
Appearance
PCBA ding,break
HDA ding,scratch
PCBA
HDA
Y
exchange
PCBA No spin
PCBA Not ready
HDA No spin
HDA Not ready
ROM failure
[AJ35]
[AJ36]
[AJ33]
[AJ34]
[AJ39]
[AJ46]
[AJ37]
PCBA ERROR
HDA ERROR
Power Test
Y
N>
AUTO TEST
PCBA&HDA failure
MOTOR Noise
↓
START
HEAD ERROR
HEAD failure
[AJ43]
HEAD Check
N>
①
②
Write head in Max cylinder before write test (if Error: -Next Cyl TEST (until 10Cyl if it is fail)
Y
±
Seek Test: 100Cyl Seek per dimension (if 3 more error per dimension, Fail) (OD: 100, MD:
50, ID:-100)
PES ERROR
PES Check
Y
PES FAIL
[AJ47]
RRO ERROR
MECHANISM
N>
M/C ERROR
M/C Check
M/C FAIL
[AJ48]
N>
Maintenance Cylinder 0 ~ Maintenance Cylinder : When it Read to Happen Error on CYL number1
Y
HEAD RETRY
I/D scatter hits.
I/D continuous
M/D scatter hits.
M/D continuous
O/D scatter hits.
O/D continuous
SEEK NOISE
[AJ42]
[AJ22]
[AJ23]
[AJ24]
MEDIA ERROR
MEDIA Check
N>
[AJ25]
[AJ26]
[AJ27]
[AJ38]
Hand TEST
※
↑
continuoud: more than 15Cylinder
Virus
AUTO
DEFECT FREE
N>
VIRUS
[SJ15]
Fdisk/Format
SYSTEM
ERROR
FAT,format error [SJ16]
N>
N>
compatibility
[SJ13]
Booting
TEST OK
[SJ19]
[SJ12]
[SJ23]
Y>
TIMEING
ERROR
control speed
other failure
PASS
20
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
8. How to progress Burn-In Test
1) Summary of B/I Test
Progress defect detection and reliability test of HDD according to program written in
± ℃
5
±
, humidity 50 10% stress condition.
maintenance/cylinder in temperature 40
2) Progress B/I Test
①
A way of detection for HDD defect by reading/ writing the existing written information.
3) Flow sheet.
①
Down load if small defect like mentioned above occurred.(Progress ALT-I in HUTIL program)
(Be sure to check download before progress B/I program. Led off if there is no program down
loaded or maintenance/cylinder is unreadable.)
ⓐ
As Main and B/I Firmware are separate from VG11/VG11+ series, progress test after changing
to B/I Firmware before test.( if B/I finished, change main firmware.)
Check appearance & jumper pin status.
②
(B/I test is Led off if jumper pin connection is incorrect.)
③
④
⑤
Connect drive to power supply.(same as drive ready.)
If drive is progressing burn-in regularly,led blink after ready.
If drive is progressing burn-in irregularly,led off after ready.
(Led Off or ready state if the initial state isn't burn-in low or cont-in flow when we check
B/I program by loading burn-in program: written by how to B/I flow, SETC 0,SETH 0,
SETS 5,(M/C region)
⑥
Mark failure and Led frequency appear when lots of defects are occurred or error in drive
is occurred during burn-in test.)
⑦
Led is repeated one time if pass after done test.
(Be cautious because burn-in test time is different by every model)
⑧
Write end-in flow on maintenance/cylinder if pass after done test and write fail-in flow
in fail case.
⑨
Led blank after write the test result. Pass: repeat one time. Fail: the number of error code.
4) Subject of B/I Program
Progress B/I Program
- Main order: LED Bilnk
: Format
: Change Pattern
: Change Slvel Label
: Change Retry Count
: ECC ON/OFF
: Read Track Reverse
: Read Track Forward
: Write Track Forward
: Write Track Reverse
: Random Write
: Random Read
- Record M/C if error happened
: recording location - from CYL 1, Head 0 SEC 1
21
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
5) Failure status and repairing
Failure state
State
Method
Remarks
●●
●●
●●
●●
Jumper pin
connection
failure
-LED off after
-Check the location of jumper pin and
execute to change.
DXX:All sorts of jumper
DCF:Size operation pin
DSP:Master/slave operation
-C/D:Master/slave operation
ready when drive
is connected.(Not
execute burn-in )
(The location of jumper pin is always
in "-C/D".)
Not down load -Led off after
ready when drive
-Don't execute down load
:execute again.
-Read cyl:1, head:0, sec:5 on
Maintenance/cylinder and check the
burn-in program write state.Be sure
to be in
is connected.(Not
execute burn-in)
"Burn-in Flow" state if dump.
1.INIT 0 2.SETC 1 3.SETH 0
4.SETS 5 5.PHRD 1 6.DUMP
- Write location according to
test result
-Order"Can't~" is
occurred during
progressing down
load(ALT-I)in LEO
program.
-Order"Can't~" is occurred during
re-progressing in down load
state,check the drive burn-in state.
CYL:1 HEAD:0 SEC:10
Read Program
1.INIT 0
2.RTRK 3.ADDH 1
4.JLUP 2
MAINTENANC -Can't read burn-in -Error is occurred in reading
-Check the error state by
reading CYL:1 HEAD:0 SEC:5 in
maintenance/cylinder.
E /CYLINDER program so
read Failure perceive as not
maintenance/cylinder or no error is
occurred in writing&formatting
down loaded state. maintenance/cylinder,progress pre-test
again or down load then execute
-Execute one more heads during
writing & formatting not one head
only.(Failure can't duplicate if
Burn -in.
-If failure is occurred in entire head
during writing or formatting ,check out check the same head )
after changing PCBA.
-If defect is occurred, catch hold of
failure symptom and failure degree
then progress operation,execute servo
write change disk.
(process in head office.)
LED failure
-Drive is ready
regularly but only
led can't run.
-Due to led specific & imperfect
soldering - change PCBA then repair.
PCBA failure
Power cable
failure in
-NO power state
-Off condition if
power cable is
-Execute again after changing PCBA.
-Short occur when it is connected
drive to power cable, then come to
burn-in rack
connected to drive. off so unplug power cable and
reconnect in 30 second.
22
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
9. Caution
※
Hard disks are very fragile electro-mechanical devices, which are very sensitive to external
shock and vibration, therefore be careful when you use not to be impacted and broken
by static electricity.
1) Handling Damage example from impact
①
If you move HDD while it is running: Spindle motor of the interior in HDD start to spinning
at high speed as soon as power on. Accordingly, if you move HDD without fixing previously
when power on, head is possible to collide disk and at this time floating particles occur.
And these particles damage to disk then cause failure.
②
If you dropped or knocked HDD: If you dropped or knocked HDD even though while it isn't
running, head collide disk due to vibration of ARM and at this time floating particles occur.
And these particles damage to disk then cause failure.
2) Damage example for static electricity
①
Man is easily charged with electricity so if we handle PCBA of HDD, the high-voltage
affect on IC or circuit and this become a failure cause.
3) Unconsciousness characteristic of product
①
Keeping the interior of HDD stainless make work regularly without particle of head or disk
therefore the interior of HDD is configurated in clean room,after done configuration all
cracks through the exterior are sealed by label so if user doesn't recognize this
characteristic, disjoint the HDD or remove Label or loose Screw could be a failure factor
caused by polluted particle.
4) Caution in center
①
There is such case that failure set is arrived in head S/C attaching label written failure
name to PCBA or the connecting part between cover of HDD and base after screen about failure
set receipted in center. In this case we have difficulties in repairing because we can't
remove label. It still looks like failure appearance after done repairing in case of
attaching to PCBA and if attaching label to the connecting part of cover and base, we can't
open cover when we need to separate and repair in clean room. Consequently be sure to mark
failure name in cover only.
②
③
Packaging requirement1 : Be sure to pack with anti-static bag, forwarding to the head S/C
as well as sending to customer after done preparing is the same. HDD is very fragile
electro-mechanical devices mentioned above, if we don't keep this, failure is getting worse
while forwarding.
Packaging requirement2: Be sure to put HDD in direction of 40 pin connect lower
certainly. Follow the example form of the head S/C package model. In corrugated card
board box,20 block-formed sponges is in the box. Then HDD, piled anti-static bag in each
partition, lay in the sponge 40 pin connect is lowered.
23
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
Attachment 1. The basic information related HDD
※
The basic information of HDD
The logical elements constituted hard disk
1)
①
Track: The data inputted by computer was written at tracks on disk. The tracks, in spite of
invisible,are the concentric circles from the center of disk to the outside.
The tracks are divided into spaces regularly. The number of tracks is different according to
the size and capacity of disk.
②
Sector: Data are recorded in track on disk, it means data is written on tracks which is
divided into sector on disk. The data is written on tracks which is divided into sector on disk.
A sector is a piece of pizza,naming track.
③
Side: Disk has two sides like a coin has the front and the back side.
The front side of disk is side 0, the back is called side 1.
④
Cylinder: The definition of cylinder is added the meaning of track and side.
A track 1 on side 1 is different from a track 1 on side 2. But cylinder 0 means the both
of tracks in side o and 1. That is cylinder 0 means all number 0 of tracks on both sides.
Cluster: Disk has physical mechanism that constituted track (divided by the location of
read/write head ) and sector (divided by track). It's a fact that there is a real logical
factor, that is cluster, make the data can read/write.
⑤
One cluster consists of two sectors usually. The capacity is 2 Kbyte commonly in hard disk.
But we are cautious that no matter what the data is so small,use one independent cluster.
For example, a cluster occupy 1 Kbyte can't written any other files.
The rest of cluster are useless. If we have 1,025 Kbyte file, we need two cluster to written.
If the size of cluster is getting bigger, the efficiency of disk is lower but the speed of
that is faster than.
※
refer to picture - Track,Sector,Side
Wudfn
Vhfwru
Vlgh 4
+Xs,
Vlgh 3
+Grzq,
24
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
2) The logical mechanism of hard disk
Hard disk consists of boot record, FAT, root directory, data field.
①
Boot Record: Boot record is consists of sector 1, track 0, side 0.
Boot record is the one of most important parts. It has some information about the physical
structure of disk. If boot record is vanished, the disk is useless entirely.
The physical information mean, for example, the number of FAT, capacity of disk something
like that. Also has boot record also contains programs to make work the operating systems.
The program which is capable of working the operating systems is the definition containing
several specific information like the number of byte per sector, the total of sectors in disk.
FAT: It says that quota information field: that is the memory field about where the file is
located in real data field. Just like we are known the rooms occupied or empty by a hotel
account book. Most files occupy several cluster not just one cluster. Cluster belong to a
files is scattered in many parts on disk, not existing constantly. If cluster is vanished
or destroyed, we don't know the linking state. So we can't read files properly.
Root Directory: All of disk have only one root directory. Root directory exist certainly
whether sub directory exist or not. Root directory is the memory field which remember the
files on disk and the list of sub directory. And sub directory is treated as files in root
directory. Using the disk is restricted when root directory is damaged like as file quota table.
②
③
3) Terms about hard disk
①
Seek Time: Seek time is referred to the time that head in disk takes to located a particular
piece of data which has information the head want to read. Disk speed is getting faster
according to seek time speed. Strictly speaking, seek time of track vs track tell the more
accurate disk speed. Seek time of track vs track refer to the time that the disk head which is
in present location move to the just next side of sector of track.
②
Access Time: The access time for disk drives includes the time it actually takes for the
read/write head to locate a sector on the disk (called the seek time). For example, the last
read head located on track 3 and the next information is located on track 4,the time to try
want read(access time) is the same for a seek time of track vs track. But we are not sure the
location of the next information we regard this as a average time. This is an average time
since it depends on how far away the head is from the desired data, it is similar to a time
that head takes to spin a half of the whole track.
④
Latency: In general, the period of time passing through the unreadable region.
Its time is similar to passing time across the half of hard disk circle.
⑤
Inter-Leave: The physical sector numbers among the continuous sectors logically on disk.
Logical sector is not corresponding to that of physical: the reason is that disk head needs
some time can read next sector from the first sector accepting data. Disk head has to keep
spinning the while. If a data in sector1 and next data in sector 2:1:1 inter-leave,
in sector 3:1:2 inter-leave. 1:1 isn't always efficiency because data of the sector1 receive
from memory then try to receive sector2, if the disk is already spun, need one more spin.
⑥
Partition : The logical region of disk. Normally disk divides logical region into
physical region. The former contains side,track,sector and the latter contains partition.
In dos systems, you can partition a disk and each partition will behave like a separate
disk drive.Dos recognize two sort of partitions.
25
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
ⓐ
DOS PARTITION : This is to dos as system disk is to floppy disk and dos is run
by this partition.
ⓑ
EXTENDED DOS PARTITION : The rest region of the disk was occupied by dos partition.
The size of partition from dos 4.0 isn't restricted, hard disk over 32MB(to DOS 3.3)
must be treated as a independent drive each diving two more partitions.
⑦
Transfer Rate: The mass of controller is transferred a data from hard disk. That is
transferring to computer after reading the data from hard disk. Transfer rate depends on
how faster the disk spin and how many data sector is recorded.
⑧
Cache: One of method to optimize capacity of disk drive. Drive using read cache send
a data to host computer ,on the contrary write cache used when host send to drive.
ⓐ
Read Cache: How to read the continuous data as well as data needed by host.
This is possible because the files in drive storage orderly. If the host want information
read before, we transfer information data in buffer without reading dada again.
This can be picked up the speed.
ⓑ
Write Cache: All data transferred from host are received in buffer of disk drive, host is
informed that written already. While disk drive is recording,host can record another
information therefore system efficiency is improved. But this is risk loss of data when
power is cut off before recording the data yet. PC use write cache within operating systems
like smart drive, so PC doesn't have such like a risk. Disk controller,which manages the
interchange of data between drive and computer,and hard ware and soft ware in the circuit
of disk controller and disk drive. PC is used AT(IDE) and SCSI interface normally.
ⓒ
Disk controller,which manages the interchange of data between drive and computer,and hard
ware and soft ware in the circuit of disk controller and disk drive. PC is used AT(IDE) and
SCSI interface normally.
⑨
⑩
IDE Drive: Abbreviation of Integrated device electronics. This drive make all circuits
connected to AT bus directly by putting within drive, we call this general AT drive.
Enhanced IDE: Current IDE spec only two drive can be attached and the speed isn't fast.
The higher capacity of system,the lower that of the whole system due to that of HDD. Enhanced
IDE is an improved IDE-AT Interface spec. resolve the problem like lower transferring speed
and 528MB barrier cause by current BIOS. Fast-IDE Interface or local bus IDE-AT Interface are
the same.
⑪
SCSI: Current IDE spec only two drive can be attached and the speed isn't fast. The higher
capacity of system,the lower that of the whole system due to that of HDD. Enhanced IDE is an
improved IDE-AT Interface spec. resolve the problem like lower transferring speed and 528MB
barrier cause by current BIOS. Fast-IDE Interface or local bus IDE-AT Interface are the same.
⑫
Defect-Free: A region isn't able to read exist in media. When we find defect like this in
manufacturing process, we replace with the normal region. Thus we can supply perfect drive to
user. Defect magnet is a method can arrange the defects in read/write from the replaced sector.
⑬
ECC On-the-Fly: A region isn't able to read exist in media. When we find defect like this in
manufacturing process, we replace with the normal region. Thus we can supply perfect drive to
user. Defect magnet is a method can arrange the defects in read/write from the replaced sector.
⑭
Multi-Zone Recording: Zone-bit recording or constant recording are the same. In case we
record data on spinning disk in constant frequency signal, shorten the inside caliper and
lengthen the outside diameter. If we make this evenly, the capacity of drive is improved.
26
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
⑮
Master/Slave/Cable Select: When we attached 2 IDE drive, one is master and the other is slave.
Being a M/S whether or not of drive is determined by jump in drive or cable select.
●
BPI: Abbreviation of bit per inch, recording density towards a circumference. Usually we
decide the maximum diameter of track.
●
Buffer: The RAM where executed data between HDD and host computer is stored in RAM
temporary.
The resolution of the bottleneck according to difference of speed and improving the efficiency.
Controller: Same as disk controller, chip or circuit make possible transfer command and data
of computer according to HDD.
●
●
DMA: Abbreviation of direct memory access, a technique for transferring data from main memory
to a device without passing it through the CPU. This is useful for making quick backups and
for real-time applications.
※
Servo
Local control technology enable to read and write data.When spinning flatter high-speeded
read data, head is the accurate position according to the position written data,this
technology could be a standard about HDD efficiency. Local controller apply stepping
spindle motor or voice coil motor to head located in actuator and settled a position.
More over another important factor is how far the magnetic head could fly on the surface
of hard disk. The lower the height of magnetic head is, the narrower the magnetic region
on the disk surface, so the more data can be read or written on the same disk surface.
27
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
Attachment 2. Explanation of HDD terms
Access
Read, write, or update inforamtion on some storage medium such as a disk.
The interval between the time a request for data is made by the system and the time the data
Access time is available from the drive.Access time includes the actual seek time, rotational latency and
command processing overhead time.
Actuator
The internal mechanism that moves the read/write head to the proper track
Allocation
The process of assigning particular areas of the disk to particular data or instructions.
Allocation
Unit
An Allocation unit is a group of sectors on the disk that can be reserved for the use of a
particular file.(usually in the form of sector, block or cluster)
Buffer
An area of RAM reserved for temporary storage of data that is waiting to be sent to a device.
Air Bearing Surface. Establish flat surface slantingly at the both sides of head to make head
rise on disk by using air pressure.
ABS
Access
Access time
Reading, writing, updating information stored in disk.
Time from requesting data to assuring data on disk in system.
(contained seek time, rotational latency, command processing overhead time)
Actuator
AFR
Mechanism of making read/write head move to the proper track.
Annualized Failure Rate. Accumulated failure rate.
Allocation
Process of storing Data instruction at the particular region in disk.
Allocation
Unit
Remaining sector set on disk to be used for specific file.
(commonly, in form of sector, block, cluster )
APM
Advanced Power Management Hardware.
Areal
Density
×
Recording capacity per 1 square inch. Areal Density = BPI
TPI [Mb/Inch]
Assembled HGA(Head Gimbal Assembly) and VCM at the back and forth of ARM. Parts which
is connected to pivot bearing of base. (Parts enable to move head to proper location on Base
physically)
Arm
AT
Advanced Technology interface or IDE. Interface to be designed for IBM transfer PC.
AT Attachment Device. Device is equivalent to ANSI ATA spec. HDD, contained tape drive,
CD-ROM.
ATADevice
Improved the existing AT interface, Interface is correspond to E-IDE of W/D by suggestion of
Seagate
ATA-2
Audit
Examine the factory.
Average
Seek Time
The average time it takes for the read/write head to move to a specific location.
protect information recorded in media from damage by breaking the remained current flowed to
head in magnetic body.
Back Gap
Bad Block
A block (usually the size of a sector) that cannot reliably hold data because of meadia flaw or
damaged format markings.
Lead plate to maintain the balance of ARM. (The amount of disk and head are different in case
of different capacity of the same series, so this maintain the center of gravity because the
center of gravity of ARM is changing according to those of head changing. )
BALANCING
PLATE
Basic frame for parts assembling of HDD. spindle motor, arm, VCM, cover, PCB are assembled
on Base.
Base
28
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
Abbreviation of pivot bearing, Mediator of Arm and Base which is located in the center of ARM
and it can rotate smoothly.
BEARING
Bezel
BIOS
bit
A plastic panel that extends the face of a drive so that it covers a computer's drive bay opening.
Basic Input/Output system: Control program/sub-program can control computer and around device.
A binary digit may have one of two values-1 or 0
Located in the first track and sector in disk where store physical structure information of disk.
(sector1, track 0, side 0)
Boot Record
BPI
Abbreviation of Bit Per Inch, it means the recording density towards circumference. Generally it
decided to the value of maximum track.
BPS
Bit per second. Data transferring speed, transferring bit numbers per second.
BPSI
Bits per square inch = areal density, Bit numbers per 1 square inch, BPSI=BPI x TPI
Breather
Filter
Filter to prevent contamination occurred inside due to outside air, it is putted on air plug.
Temporary RAM to store data between HDD and host computer, it is used for efficiency
improvement.
Buffer
Burn-in test Reliability test with changing temperature, voltage condition.
Bus
The part of a chip, circuit board, or interface designed to.
Unit of digital information. 1 Byte is 8 bit.
Byte
Optimizing method for drive efficiency, read cache is for data transfer from drive to host
computer and write cache is from host to drive. (256KB in normal. It mediate the bottle-neck
due to speed difference between drive and PC host)
Cache
Capacity
Information amount could be stored in HDD. Units are MB, GB
Clean Room No particle room for MP or RMA of HDD. Grade of 1000ppm, 100ppm, 10ppm etc.
CLIP-FPC
Clock
Components to assemble FPC and SUPPORT-FPC.
Timing standard signal to treatment balance.
The logical factor to read/write real data. One cluster is bind 2 sectors generally, its size is
2kbyte.
Cluster
Compatibility
test
Test hardware device or software's compatibility to confirm compatibility.
Controller
Cover
Disk Controller also, chip or circuit can be transfer data order of computer to available to HDD.
Protect parts within HDD from the exterior impact and particle and moist ,the fatal fact caused
head and disk failure.
Central Processing Unit. Control input/output device and sending, computing,recording data and
output the result.
CPU
Protect activator's impact in emergency condition when head move to parking zone or come off
data zone.
Crash Stop
CRC
Abbreviation of Cyclic Redundancy Code, detect error differ from ECC containing error correcting
function. For protect ID data.
29
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
Data is recorded on lots of circle in media in HDD, we call these circles track.. We record data
at both sides of media and HDD has many media layers. so it has several tracks which have
the same radius, we call this concentric circle collection of track Cylinder. Tracks are divided to
sector and it organized ID information and data and ECC. ID information is a sort of address
information to seek data sector requested from host computer.
Cylinder/Trac
k/Sector
Data
Separator
Separate complex data/clock signal from HDD stored data/timing information encoded form.
Restore encoded signal.
Decoding
Dedicated
Servo
Concentrate servo signal (Timing & location control signal) on on side of drive.
Defect
Management
Find defect and treat data from replaced sector on read/write.
HDD vendor received disks from media vendor for smooth supply and proper price and these
media has defect( region can't read write data), by scanning defect during production process
and replacing normal region so we can product defect-free drive. Defect management means
scanning defect and treatment process from replaced data during read/write.
Defect-Free/
Defect
Management
Disk
Head record data in this circle plate, magnetic disk is general.
Group assembled the separate HDD for large capacity.
Disk array
Direct Memory Access, data transferring method among system memory and HDD without CPU.
By using DMA, CPU can do other works while data transferring, efficiency become improved.
DMA
DOA
dead on arrival, arrival failure.
DPPM
Defect parts per million, failure unit.
Drive
Geometry
Functional definition according to the numbers of head,cylinder,sector per track.
Design Verification test.
DVT
ECC
Error correction code. Correct error data, controller scan and correct error combining user data
and parity bit.
ECC is Error Correction Code, Additional recording information per every sector. By ECC
creation logic, data is added on disk and checking and correcting with reading. If it is
correctable error without read action stopping, we call this ECC on-the-Fly with hardware's help
within controller.
ECC
on-the-Fly
E-IDE
Enhance
IDE
Revised interface in IDE way, new specification to improve the existing method has problem of
low speed.
Embedded
Servo /
Dedicated
Servo
Embedded Servo: Arrange servo signal(timing,location control signal) to data and data track in
parallel. Dedicated Servo: Mechanism of dedicated surface of disk have timing and positioning
information only.
Encoding is a data transferring method before recording data pattern to disk and Decoding is on
the contrary. To read recorded data more easily and accurately, Encoding and Decoding should
be needed. Coding methods are MFM.(2.7)RLL.(1.7)RLL.
Encoding/
Decoding
30
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
The existing IDE specification enable to adhere only 2 drives and transferring speed was low.
But HDD efficiency are resulted to low the whole capacity according to getting system efficiency
higher. Enhanced IDE has specification of revised IDE-AT interface by current BIOS and 528Mb
barrier and we settled the low speed problem with this new spec. Same as Fast-IDE Interface
or Local Bus IDE-AT Interface.
Enhanced
IDE
EOL
End of Life.
EPROM
EVT
Erasable programmable read only memory.
Engineering verification test.
File allocation table. Data table is recorded at the most outer side of disk, inform sector
location and order of each recorded file to Operating system.
FAT
FCI
Flux change per inch. magnetization rotation density per unit inch.
Flux Change Per Inch. Magnetization rotating density per unit inch. Concerned with BPI, this
value is decided by track has maximum radius. BPI is proportion to FCI according to difference
of coding method.
FCI/FCPI/Flu
x Density
FDD
Floppy Disk Drive. 5.25"/3.5" drive is used for PC
FILTER
Firmware
Components filtering particle from the flowed air to the inside/outside of HDA.
Hardware control program, this is stored in
Flash
Memory
Among PROM of the memory for searching only which can re-write, memory chip enable to
rewrite and erase the old contents electrically.
Flexure
Assembly
Control rising by Slider ABS, flying height of slider and make slider move to proper track by
connecting to head positioning mechanism.
Flux Density Flux density, the number of magnetic field pattern can be recorded on the disk surface.
Distance between Read/write head and disk surface. Air resistance due to disk rotation can
maintain this distance, the small flying height is, the large data recording density is, but it need
more specified mechanical design.
Flying
Height
Form factor Industrial specification decided diameter of Disk. 3.5", 2.5" in case of Samsung.
Recording the particular signal to divide track and sector and this information should be recorded
Format
on disk in first before user want to store data. Be careful because formatting erase all recorded
information.
Formatted
capacity
Available HDD capacity after HDD formatting.
Flexible Printed Circuit, or PCC, inputted parts enable to flow current to the flexible material.
(Polemize)
FPC
Status of soldering IC, CAPACITOR, 14PIN CONNECTOR to FPC surface or connecting
HOLDER-FPC, SUPPORT-FPC, CLIP-FPC.
FPC ASS'Y
GASKET
Parts made of rubber to protect inner inflow air and moist from the outside of HDD
Data storing unit. Accurately 1,073,741,824 bytes(1024*1024*1024), i.e. 1,000MB
GigaByte(G
B)
GMR Head
Half height
Giant Magneto Resistive head. New type head of MR head.
One of the standard height specification of HDD and the real height is 1.6inch
Hard
Error/Soft
Error
Hard error is a continuous misreading due to defect of disk surface) and it can read correct
data if in case of read again, we call this soft error.
Head Disk Assembly, half assembled product of HDD. SPINDLE MOTOR, DISK, HSA, VCM etc.
are sealed within Base and Cover.
HDA
HDA label
Label remarked assembly status of Disk/Head by 5digit-english & number.
31
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
Hard Disk Drive, memory device by transferring data to permanent magnetic field rather than
digital pulse. It organized HDA and PCBA.
HDD
Head
Read/write data on disk directly. (MIG, Thin film, MR,GMR)
The damages of read/write and media cause a sudden contact between head and disk surface,
they are also occurred because of dust,particles or other contamination within HDA.
Head Crash
Head Stack Status ARM and HGA assembled.
Height
HGA
Vertical height of HDD ( 1 inch height is used generally in case of 3.5" drive)
Head Gimbal Ass'y, recording and replaying data and it organized slider and suspension for
supporting slider, usually we say Head..
High-Level
formatting
Progressing mechanism to format program of management system. Root directory, File allocation
table created.
HOLDER-FP
C
Parts made of plastic enable to make routing FPC.
HSA
Hz
HEAD STACK ASS'Y,. Assembled HGA with FPC ASS'Y in ARM.
Herz. The number of event during 1 second.
Data Input/output
I/O
Integrated circuit.. Electric circuit,assembly of elements of transistor,diode,resistance on the thin
plate of semiconductor. CPU of PC and RAM are sort of IC.
IC
Integrated Device Electronics. In IBM PC AT, drive type enable to connect all circuits to AT
Bus directly
IDE
Integrated Device Electronics, In IBM PC AT, drive enable to connect all circuits to AT Bus.
Generally, AT drive.
IDE Drive
Initialize
Refer to low level formatting.
Disk controller to manage data between drive and computer and hard ware & software contained
within disk drive circuit. AT(IDE) and SCSI interface are usually used in small computer system.
Interface
Interleave/
Interleave
Factor
Order of sector arranged within track. For example, interleave factor is 3:1 then arranged by 3
sectors for sector interval, that is, it is possible to read sector2 after reading sector1 by leaping
over 2sector. We need 3 rotations to read all data of track. Now days, Most interleave is 1:1.
IQC
Incoming quality control. Inspection process for import.
Jumper
Jumper Pin
Device in type of hardware, it decide HDD connecting status (Master/Slave etc.)
A small parts enable to choose drive running mode.(Master/Slave)
KB = Kilo Byte, MB = Mega Byte, GB = Giga Byte. K,M,G have double meanings. First,
K=1000, M=1000000, G=1000000000, second K=2^10=1024, M=2^20=1048576,
G=2^30=1073741824. The second one is more accurate mean on HDD capacity, but we usually
we use by the first one.
KB/MB/GB
Both of them means the landing location of head when spindle motor stopping. This zone used
for protecting the risk of data damage caused from the contact between head and disk, this
zone is not stored. Recently most drives using VCM are designed head should be landed in
landing Zone automatically.
Landing
Zone/Parking
Zone
Latch
Parts enable to hold ARM putting on head in constant power.
LATCH
SCREW
HEAD is located in parking zone on off, at this time latch screw connected in parking magnetic
and make head fixing. (latch force is determined by magnetic power )
Waiting time until target sector seek time after Read/Write Head arriving at the target track.
(Generally, 1/2 of spindle cycle ). One cycle time of disk is 16.7ms in case of spin speed is
3600rpm, then average waiting time should be 8.3ms. This Latency is a one of most factor for
drive efficiency, transferring speed is better getting shorter waiting time.
Latency/Rota
tional
latency
32
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
LBA mode
LED
Logical block allocation. DOS mode to resolve 528MB capacity restriction.
Light Emitting Diode. Used for signal light to all kind of electric containing computer.
One of standard height of HDD, the real height is 1 inch.
Low profile
Low-level
formatting
Operating system make sector on disk enable to access in proper region in order to create file
structure.
HDD become booting when put 2 more IDE drives. ( decided C:, Managed master/slave by
Jumper control & CMOS setup)
Master
When 2 IDE drives operated, one drive become Master(drive C: or drive 0) and the other is
Master/Slave Slave.(drive D: or drive 1) Master/Slave is determined by using jumper within drive or Cable
/Cable
select
select method. jumper setup is different from companies,so refer to usages, Cable Select has a
complex jumper method so drive become master/slave automatically according to decided signal
for Cable Select..
Media
Aluminium
Plate substrate coating with magnetic body. Casting with lubricant to prevent damage for Head
landing/off, where data stored in form of magnetic flux or politary change.
Mega
Byte(MB)
Data storage unit. Accurately 1,048,576 Bytes(1,024*1,024). that is 1,000KB
Clock speed unit for PC, clock occur million times per second
Collection of CPU function to LSI( large IC).
Mega
Hertz(MHz)
Microprocess
or
Read metal in gab head, Improved head has high valued inductance by inserting metal around
gab of core.
MIG
Millisecond
MMX
One thousandth. Speed unit of HDD efficiency.
Multimedia Extension. Intel's new CPU chip. Added new 57 orders to run image and sound,
efficiency is improved about 10~20%.
MP
Mass production.
MPC
Multi-media Personal Computer
Magnetic Resistive head. For high-efficiency HDD, IBM developed the marginal head which is
enable to separate read/write applying MR elements to read head of thin film head.
MR head
MRB
material review board.
Mean Time Between Failure, average time of occurring failure. This is one of most important
reliability factor, not the actual measured value but the calculated value of every companies.
MTBF
MTTF
MTTR
Mean Time to failure. same as MTBF
Mean Time To Repair, average time to repair. Generally the replacing time of PCBA or HDA.
Zone-Bit Recording, Constant Recording. While recording data on rotating disk, the inside
diameter get shorter of sector length and outside diameter get longer of that if the frequency of
signals is constant. So we make drive capacity higher if make the sector length same with
outside diameter and inside diameter. We also say Constant Angular Velocity, CAV and
Constant Linear Velocity, CLV.
Multi-Zone
Recording
MVT
ORT
Maturity Verification Test, Test for MP possibility.
On-going reliability test. Test for MTBF and long time test in normal condition. ( Burn in test
progress with mal-condition)
Operating System. Control and manage computer system to use more easily for user.
(DOS, UNIX etc.)
OS
Outer Crash
Stop
Parts decide outer range as ARM can move, this parts is a stopper of HEAD out of DISK.
33
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
Time to perform the real order for controller, host adaptor and drive. The faster overhead is,
the faster performing time.
Overhead
Overwrite
Recorded data erased by overlapping the existing data.
Parking
Zone
= Landing Zone
When we use one HDD for multi ones dividing section logically, every memory section is
partition, For example, 2.5GB HDD can be used for one 2.1GB computer and one 400MB.
Partition
PCBA
Printed Circuit Board Assembly. Kind of IC and Chips are Soldered on board and make run
HDA, PCBA is a half-finished goods.
PCMCIA
Pentium
Personal Computer Memory Card International Association.
586 Microprocessor to apply IBM type developed by Intel
Pentium
Pro(P6,686)
Pentium's next CPU. 5.5 billion transistor integrated. There are 150, 166, 180, 200MHz.
Peripheral
PIO
Additional device except basic CPU. There are Disk Drive, Tape Drive, CD-ROM.
Programmed Input/Output.
Pivot
Bearing
Roll bearing is fixed on the rotating center of ARM.
Plated
Media
Disk is covered with hard metal alloy rather than disk Iron-oxide compound.
The more data could be stored.
Platter
POH
Metal disk record data within HDD
Power On Hour, used for MTBF.
Power PC
PQT
RISC type CPU is developed by IBM, Apple and Motorola commonly.
Pre-qualification test
Partial Response Maximum Likelihood, this is a read/write method to improve recordi density and
data transferring rate. This method enable to improve capacity as 30% more than the existing
data transferring by using Peak Detection.
PRML
PVT
Production verification test
QMS
Quality management system. Overall quality management system
Redundant Arrays of Independent Disks. To protect a sudden data damage, connect HDD in
parallel and diverge data , that is high speed back-up device enable to improve data
preservation and low speed access for tape the problem of the current back-up device.
RAID
RAM
Random access Memory. Semiconductor memory enable to input and search,we have DRAM
and SRAM.
Look-ahead method is not only reading data requested from host but also reading- ahead
continuous data to buffer sequentially, We improve data transferring speed because we don't
need to read again in time host request information pre-read by applying for file's sequential
saving method.
Read cache
Read
Order of reading all data from HDD, read sector occur interrupt per every sector transferring,
Sector/Read read multiple occur interrupt per designated sector number by set multiple order. Also read DMA
multiple/Rea occur interrupt only one time after transferring data from host request. For example, 4 is chosen
d DMA
by set multiple and host need 10 sectors then the below picture draw how to occur Interrupt.
Recoverable
Err/Uncovera Similar to Soft Hard err. Recoverable err means it is possible to read normally though data was
ble read wrong, unrecoverable err means it is impossible to recover error by any means.
Err/Correcta Correctable err is belong to Recoverable err, this is recovered by software ECC.
ble Err
34
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
RETAINER
RING
Component could fix bearing when inserted to ARM.
Encoding method "run length limited data" to magnetic pulse.
It can store data 50% more than MFM(Modified Frequency Modulation) method.
RLL
RMA
Return Material Authorization
Searching only memory. memory would not erase during off, so we use this to program or data
need not change in PC. Mask ROM input contents when it's manufactured and PROM recorded
program by user.
ROM
Root
Directory
The place where file on disk and sub directory list.
Rotational
Latency
Time which controller find proper data with track rotating, head read/write. Generally 1/2 of full
rotation hour.
RPM
Revolution per minute. RPM is higher. the data searching speed is getting higher.
Small Computer Systems Interface. IDE drive can put only 2 drives on the same bus (4 drives
in case of Enhanced IDE), SCSI can put 8 drives on the same bus. Also it can be connected
HDD and other various device,CD-ROM, Tape drive, Printer etc. as well. 16 bit Fast SCSI can
transfer data in 20Mb speed per second. Apple Macintosh and UNIX operating system use
mainly.
SCSI
Sector
Seek
Minimum classification unit which assigned by drive to store information.
Moving read/write head to the particular data track.
Time which head is located the current post move to another head written information should be
read.
Seek time
Server
Computer and device to produce every server to PC on PC LAN network.
ⓐ
ⓑ
Control system in feed-back way to move the accurate location in device,
Signal recorded pattered disk in every side to be capable of HEAD location controlling.
Servo
Servo Data
Magnetic marking written within media enable to move read/write head to accurate location.
Servo information recording equipment on HDA assembled.
SERVO-WRI
TER
Settle time
Time which head read/write the real data after arriving on proper track.
Shock
Rating
Enduring number without disk drive damage.(G unit) It is differ according to run/unrun number.,
In case, several PC is connected to one PC, the rest drives except booting system(C:)
Slave
Slider
The core part of head ass'y, made for head can surface on disk, it's organized ABS, Core, Coil
in general.
Self-monitoring, Analysis and Reporting Technology. Technology of reporting the HDD inner
status and analysis to Host.
SMART
SPC
Statistical Process Control.
Spindle
Center shaft of drive connected hard disk platter.
Spindle
motor
Motor enable to rotate disk in continuous speed. (high speed:4500rpm,5400rpm etc)
Serial Storage Architecture. High speed and high efficiency interface technology of IBM
correspond to Seagate's FC-AL interface.
SSA
Track
HDD have numerous circles in media, and these circles write data, we call this circle track.
Track density (attachment: TPI)
Track
density
35
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
Transfer rate Data transferring speed among PC and other devices of HDD.
The existing thin film head have 2 ABS and adding one more ABS, head is designed to be
Tri-pad head
profitable to low flying height. Produced by SAE, ReadRite company.
Unformatted
HDD capacity before formatting.
capacity
Universal Serial Bus. Particular chip was connected in period plate and manage keyboard,
USB
VAR
mouse, printer,modem, this chip unify the connecting pot shape of other device period plate,
then make easy to connect and speed is 10 times higher than the current vertical connection.
Value Added Re-seller. Vendor sell the existing product after making higher value added.
Voice Coil Motor: Stable and high speed motor applying speaker system, make move head in
proportion to magnetic strength. Motor used voice coil has fewer components than step motor so
it is strong for stress and abrasion and move head in high speed. They divided Rectangular and
Flat coil type of VCM according to shape and Linear and Rotary type according to rotation
method. Recently flat coil type and rotation type is general.
VCM
VCM COIL
Trapezoid shaping parts connected to ARM with winding coated write in 250 times.
Disk drive same as fixed Disk and hard Disk. Winchester was the of developing model at that
time by IBM, establish fixed magnetic disk within airtight space then head rise on connecting
disk, we apply to all kind of hard disk drive now days.
Winchester
Disk
Window
Clock
Make hole so head for servo write to write locational information could enter inside of HDD.
Window
Pusk Pin
Pin hole to enter HDA.
Write cache improve system capacity, i.e. make possible to work while recording information on
Write cache disk and this is risk to loose data when off but PC use write cache within operating system like
smart drive to prevent that risk.
36
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
Attachment3. Q&A
※
Customer's Q&A
1) What is "Bad Sector"?
Bad sector is divided physical Bad sector(Hard defect) and logical Bad sector(Soft defect).
①
Physical Bad sector
Visual defect occur in the surface of disk where is recorded data, it contain the minute
defect could checking with electric microscope. The main occurring cause of physical bad
sector are particle,impact,vibration. Among them, impact is the most serious cause, this
affect other components and bad sector as well and get weak HDD status( noise,bad sector).
Logical Bad sector
②
We can't find physical error on the surface of disk where the real data recorded but
actually abnormal data recorded in this case. Physical bad sector occur due to sudden
effect(stoppage, unstable power, head mis-running due to impact/vibration,unstable
finish, Virus,colloision with other hardware). But real data storage could not damaged,
if you over write data again, you can use newly recorded data without problem.
But you'd better HDD installation in state of manufactured in factory to prevent next
data error.(After data back-up)
③
Resolution for bad sector:
ⓐ
Self-examination by Shdiag program.
ⓑ
Progress low level format with clear HDD program.
2) The real product capacity is not consistent with capacity on window screen.
The reason of 4.3GB is displayed instead of 4.0GB is follows.(e.g. 4.3GB)
Generally 1K = 1000, but 1K = 1024 in case of computer.
The reason is that computer and OS can perceive only two number, 0 and 1.
So 10 square of 2 is recorded as 1024.(2^10=1024) User's capacity of HDD is
4,300,000,000 Byte, it is not changed but due to computer perceiving restriction method,
it looks capacity was reduced. Consequently remark is changed according to unit change,
the real capacity is not changed.
3) What is LBA,Large and Normal mode ?
LBA and Large mode of HDD is one of the method to recognize the high capacity HDD of
528MB more. LBA mode has been applied to SCSI, it recognize cylinder,head and sector
by the way of not three-dimensional but one-dimensional and numbering the first sector
in form of block unit is to number 0 then the sector become a unit and the assigned number
become a address, then change those numbers into physical three-dimensional address of
cylinder,head and sector. At this time, LBA mode is useful if BIOS and Hard is applied.
In case of Large mode, if the number of cylinder is in between 1024~2048, divide that
value then multiple the number of head and we can use HDD which doesn't apply LBA mode
by setting for this method and we can just establish HDD capacity until 528MB in case of
Normal mode. But we don't produce HDD in normal mode any more. The difference of Large
and LBA is that LBA is recognized as the number of cylinder was reducing in half and the
number of head was raised double and Large mode is set as the same way of general Normal
37
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
SAMSUNG HARD DISK DRIVE
mode, and extend capacity by raising the number of cylinder. Currently most of hard disk
is applied to LBA mode, so it set as LBA or AUTO in BIOS set-up.
4) PC is downed with the message of "Stack Over Flow" while HDD running or can't recognize
HDD.
If internal stack overflow error occurred on the basis of MS-DOS system
(MS-DOS, MS-WINDOWS95), increase the number of internal stacks of CONFIG.SYS file and
the usages are as follows.
STACKS=number,size
This number means the number of stacks (it is possible to designate by 8-64, Default 9),
and the size means stacks' size. (32-512, Default 128)
"Internal stack overflow" occur on using the program which can make memory assigned stack
region apply hardware work, and also this problem occur during progress of RAM residential
program or applicable program on the basis of non-windows system.
5) Bad Sector often occur.
Hard disk is supported by IDE system under the 486 computer. IDE system can set to the
extent of 2 hard disks and though it was set high capacity hard disk, the real capacity
is up to 528MB. From 529MB, EIDE( extended IDE) type supporting computer re cognize as
Bad Sector. If your computer doesn't support EIDE, you can use disk manager program,
you can download this in utilities of our web-site.
In times of CMOS set-up, make Hard disk recognized as Auto Defect in EIDE supporting
computer and make HDD mode to LBA if BIOS is AMI,Award.
6) Parking should be necessary when turn PC off?
HDD which can't supporting Auto parking has been damaged by stopping read/write head on
data region if it is off suddenly. To protect this problem, we have to move head to
parking region by parking program but we need not progress additional parking program to
move head to parking head.
38
M40S
Download from Www.Somanuals.com. All Manuals Search And Download.
|