Seagate MEDALIST PRO 6451 User Manual

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Medalist Pro Family  
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Medalist Pro 6450 (ST36450A)  
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Medalist Pro 6451 (ST36451A)  
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ATA Interface Drives  
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Product Manual  
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Medalist Family  
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Medalist Pro 6450 (ST36450A)  
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Medalist Pro 6451 (ST36451A)  
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ATA Interface Drives  
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Product Manual  
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© 1997 Seagate Technology, Inc. All rights reserved  
Publication Number: 32652-001, Rev. B, June 1997  
Seagate, Seagate Technology, the Seagate logo, Medalist and the  
Medalist logo are registered trademarks of Seagate Technology, Inc.  
Other product names are trademarks or registered trademarks of their  
owners.  
Seagate reserves the right to change, without notice, product offerings  
or specifications. No part of this publication may be reproduced in any  
form without written permission from Seagate Technology, Inc.  
Medalist Pro 6450/6451 Product Manual, Rev. B  
iii  
Contents  
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Quick specification chart . . . . . . . . . . . . . . . . . . . . . . 3  
1.0 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 5  
1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . 5  
1.1.1 Standard configuration . . . . . . . . . . . . . . . . . . 5  
1.2 Physical organization . . . . . . . . . . . . . . . . . . . . . 6  
1.3 Functional specifications . . . . . . . . . . . . . . . . . . . 6  
1.4 Physical dimensions . . . . . . . . . . . . . . . . . . . . . . 7  
1.5 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
1.6 Multisegmented cache buffer . . . . . . . . . . . . . . . . . 7  
1.7 Start and stop times . . . . . . . . . . . . . . . . . . . . . . 8  
1.8 Typical power-up and power-down sequence . . . . . . . . . 8  
1.9 Power-up sequence . . . . . . . . . . . . . . . . . . . . . 9  
1.9.1 Power-down sequence . . . . . . . . . . . . . . . . . . 9  
1.10 Auto-park . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
1.11 Power specifications . . . . . . . . . . . . . . . . . . . . . 9  
1.11.1 Power management . . . . . . . . . . . . . . . . . . . 9  
1.11.2 Power consumption . . . . . . . . . . . . . . . . . 11  
1.12 Input noise . . . . . . . . . . . . . . . . . . . . . . . . . 11  
1.13 Environmental specifications . . . . . . . . . . . . . . . . 11  
1.13.1 Ambient temperature . . . . . . . . . . . . . . . . . 11  
1.13.2 Temperature gradient . . . . . . . . . . . . . . . . . 12  
1.13.3 Altitude . . . . . . . . . . . . . . . . . . . . . . . . 12  
1.13.4 Relative humidity . . . . . . . . . . . . . . . . . . . 12  
1.14 Shock and vibration . . . . . . . . . . . . . . . . . . . . 12  
1.15 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
1.16 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
1.17 Agency listings . . . . . . . . . . . . . . . . . . . . . . . 13  
1.18 Electromagnetic Compliance for the European Union . . . 14  
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Medalist Pro 6450/6451 Product Manual, Rev. B  
1.19 FCC verification . . . . . . . . . . . . . . . . . . . . . . 14  
2.0 Configuring and mounting the drive . . . . . . . . . . . . . 17  
2.1 Handling and static-discharge precautions . . . . . . . . . 17  
2.2 I/O cable and connector. . . . . . . . . . . . . . . . . . . 18  
2.3 Power connector . . . . . . . . . . . . . . . . . . . . . . . 18  
2.4 Options jumper block . . . . . . . . . . . . . . . . . . . . 19  
2.4.1 Master/slave configuration  
. . . . . . . . . . . . . . 20  
2.4.2 Alternate capacity jumper . . . . . . . . . . . . . . . . 21  
2.4.3 Cable-select option . . . . . . . . . . . . . . . . . . . 21  
2.4.4 Remote LED connection . . . . . . . . . . . . . . . . 21  
2.5 Mounting the drive . . . . . . . . . . . . . . . . . . . . . . 22  
3.0 ATA interface . . . . . . . . . . . . . . . . . . . . . . . . . 25  
3.1 ATA Interface connector pin assignments . . . . . . . . . . 25  
3.2 Command set . . . . . . . . . . . . . . . . . . . . . . . . 27  
3.2.1 Identify drive command (ECH) . . . . . . . . . . . . . 29  
3.2.2 Set Features command (EFH) . . . . . . . . . . . . . 32  
3.2.3 Standby timer timeout period . . . . . . . . . . . . . . 34  
3.2.4 Sleep command (99H, E6H) . . . . . . . . . . . . . . 34  
3.2.5 Automatic Reallocation . . . . . . . . . . . . . . . . . 34  
3.3 Synchronous DMA Transfer . . . . . . . . . . . . . . . . . 35  
3.3.1 Signal Line Definitions . . . . . . . . . . . . . . . . . . . 35  
3.3.2 Protocol Rules . . . . . . . . . . . . . . . . . . . . . 35  
3.3.3 Error Register . . . . . . . . . . . . . . . . . . . . . . 36  
Appendix. Timing diagrams . . . . . . . . . . . . . . . . . . 37  
Medalist Pro 6450/6451 Product Manual, Rev. B  
v
Figures  
Figure 1. Typical startup current profile . . . . . . . . . . . . . . . . 8  
Figure 2. ATA interface connector . . . . . . . . . . . . . . . . . 18  
Figure 3. Connectors . . . . . . . . . . . . . . . . . . . . . . . . 19  
Figure 4. Configuration settings . . . . . . . . . . . . . . . . . . . 20  
Figure 5. Connecting cable-selected drives . . . . . . . . . . . . . 22  
Figure 6. Mounting dimensions . . . . . . . . . . . . . . . . . . . 23  
Figure 7. ATA interface connector pin assignments . . . . . . . . 26  
Figure 8. Programmed I/O timing without IORDY . . . . . . . . . . 37  
Figure 9. Programmed I/O timing with IORDY . . . . . . . . . . . 38  
Figure 10. Multiword DMA timing . . . . . . . . . . . . . . . . . . 39  
Figure 11. Sustained synchronous DMA burst . . . . . . . . . . . 40  
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Medalist Pro 6450/6451 Product Manual, Rev. B  
Medalist Pro 6450/6451 Product Manual, Rev. B  
1
Introduction  
This manual describes the functional, mechanical and interface specifi-  
cations for the Medalist® Pro 6450 and the Medalist Pro 6451 hard disc  
drives. The drives are referred to throughout this manual by their model  
numbers, ST36450A for the Medalist Pro 6450 and ST36451A for the  
Medalist Pro 6451.  
Seagate® desktop products take a step into the future with the ST36450A  
and ST36451A. These drives feature MR heads and PRML recording  
technology, Fast ATA-2 and Ultra ATA performance, segmented cache,  
embedded servo technology, low noise and power management  
The ST36450A and the ST36451A each contain five discs. These drives  
use MR heads and PRML technology that provide the drives with  
increased areal density. This means that more data can be stored on  
each disc.  
The ST36450A supports Fast ATA-2 technology and provides burst  
transfer rates of up to 16.6 Mbytes per second. The ST36451A supports  
Ultra ATA technology and provides burst-transfer rates of up to 33.3  
Mbytes per second. Both drives support PIO mode 4, multiword DMA  
mode 2 transfer modes and multiple block read/write. The multiple block  
read/write feature allows the drives to store several blocks of data in  
cache and to transfer them in a single burst.  
These drives use a 512-Kbyte segmented cache. Segmenting the cache  
provides a designated area where blocks of contiguous read or write data  
can be staged for transfer in a single burst.  
The ST36450A and ST36451A drives have other features that ensure  
fast data throughput. Embedded servo technology allows the drives to  
position the heads for data retrieval efficiently and accurately while  
eliminating the periodic thermal recalibration that can interrupt during  
data transfers. These drives also use a 16-bit microprocessor and an  
intelligent controller that provides data streaming: direct data transfers  
between the drive and the host without microprocessor intervention.  
These features allow for a sustained data-transfer rate that facilitates  
video-playback and other multimedia operations.  
These drives support Active, Idle and Standby power-management  
modes. Power-saving modes can be controlled by the computer.  
Standby mode reduces power consumption to 2 watts (typical) while  
retaining drive accessibility.  
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Medalist Pro 6450/6451 Product Manual, Rev. B  
The ATA commands with specific applications for these drives and the  
Seagate-unique commands the drives use are discussed in Section 3.0  
on page 25. A complete list of the commands the drives support are found  
in the table on page 27.  
The following is a summary of the drives’ features:  
Capacity  
6.4 Gbytes formatted  
LBA translation support  
Available software driver that surpasses the 528-Mbyte barrier and  
4,096 cylinder barrier limited by some system BIOSs  
Available software driver that provides expanded 32-bit disk access  
support for Windows 3.x  
Performance  
Fast ATA -2 (ST36450A) —burst transfer rates up to 16.6-Mbytes-per-  
second  
Ultra ATA (ST36451A)—burst transfer rates up to 13.3-Mbytes-per-  
second  
Supports DMA mode 2, PIO mode 4 and multiple block read/write.  
512-Kbyte segmented buffer  
12-msec average read seek time  
13.5-msec average write seek time  
Data streaming  
Energy-efficiency  
Active, Idle and Standby power-management modes  
2 watt typical power dissipation rating in Standby mode  
Medalist Pro 6450/6451 Product Manual, Rev. B  
3
Quick specification chart  
The following table serves as a quick reference for the drives’ perform-  
ance specifications. These and other specifications are discussed in  
“Specifications” on page 5.  
ST36450A ST36451A  
Guaranteed capacity (Gbytes) (x109 bytes) 6.4  
6.4  
12,594,960 12,594,960  
Drive specification  
Guaranteed sectors  
Bytes per sector  
512  
63  
512  
63  
Sectors per track  
Logical read/write heads  
Logical cylinders  
15  
15  
13,328  
6,536  
10  
13,328  
6,536  
10  
Physical cylinders  
Physical read/write heads  
Physical discs  
5
5
Areal density (Mbits per square inch)  
Data zones  
928.8  
19  
928.8  
19  
Recording density (bits per inch)  
Track density (tracks per inch)  
Spindle speed (RPM)  
138,011  
6,730  
5,397  
2.0  
138,011  
6,730  
5,397  
2.0  
Track-to-track seek time (msec typical)  
Average read seek time (msec typical)  
Average write seek time (msec typical)  
Full-stroke seek time (msec typical)  
Average latency (msec)  
9.5  
9.5  
10.0  
20  
10.0  
20  
5.58  
5.58  
Internal data-transfer rate  
(Mbits per sec max)  
63 to 116  
63 to 116  
33.3  
External transfer rate (Mbytes per sec max) 16.6  
Cache buffer (Kbytes)  
ECC on-the-fly (bits)  
512  
65  
512  
65  
continued  
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Medalist Pro 6450/6451 Product Manual, Rev. B  
continued from previous page  
ST36450A ST36451A  
Drive specification  
Height (inches max)  
1.027  
4.023  
5.787  
1.5  
1.027  
4.023  
5.787  
1.5  
Width (inches max)  
Depth (inches max)  
Typical weight (lb)  
Spinup current (max)  
3.0A  
3.0A  
Seek power (typical)  
9.8W  
7.8W  
7.8W  
2.0W  
± 5%  
± 5%  
5 to 55°C  
9.8W  
7.8W  
7.8W  
2.0W  
± 5%  
± 5%  
5 to 55°C  
Read/Write power and current (typical)  
Idle total power (typical)  
Standby/Sleep total power (typical)  
Voltage tolerance (including noise): +5V  
Voltage tolerance (including noise): +12V  
Operating temperature (°C)  
Medalist Pro 6450/6451 Product Manual, Rev. B  
5
1.0 Specifications  
1.1 Formatted capacity  
Medalist Pro drives are low-level formatted at the factory. You cannot  
low-level format them.  
These drives support cylinder-head-sector (CHS) and logical-block ad-  
dressing (LBA) translation modes. You can use the Identify drive (ECH)  
command to verify the address modes the drives support, the number of  
cylinders, sectors per track, total number of sectors, heads and other parame-  
ters. The Identify drive parameters are listed in Section 3.2.1 on page 29.  
Notes.:  
1. DOS cannot access more than 2.147 Gbytes per partition.You  
must create multiple partitions to access the drive’s full capacity.  
2. One Mbyte equals one million bytes.  
3. If the system BIOS does not support more than 4,096 cylinders,  
it can cause the computer to hang during startup, or it can  
truncate or wrap the cylinders. To resolve this issue, the system  
BIOS needs to be modified: the cylinder register or variable must  
be increased from 12-bits to 16-bits to accommodate more than  
4,096 cylinders.  
1.1.1 Standard configuration  
ST36450A  
CHS  
13,328  
15  
LBA  
Cylinders  
Heads  
Sectors  
63  
Guaranteed sectors  
Guaranteed capacity (Gbytes)  
ST36451A  
12,594,960  
6.4  
12,594,960  
6.4  
CHS  
13,328  
15  
LBA  
Cylinders  
Heads  
Sectors  
63  
Guaranteed sectors  
Guaranteed capacity (Gbytes)  
12,594,960  
6.4  
12,594,960  
6.4  
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Medalist Pro 6450/6451 Product Manual, Rev. B  
1.2 Physical organization  
ST36450A  
ST36451A  
Read/write heads  
Discs  
10  
5
10  
5
1.3 Functional specifications  
ST36450A  
ATA-2  
ST36451A  
Interface  
Ultra ATA  
Recording method  
PRML (8/9 ) PRML (8/9)  
External data burst transfer rate:  
PIO mode 4 (Mbytes per sec)  
DMA mode 2 (Mbytes per sec)  
Synchronous DMA mode 2  
16.6  
16.6  
––  
16.6  
16.6  
33.3  
Internal data-transfer rate  
(Mbits per sec)  
63 to 116  
63 to 116  
Spindle speed (RPM)  
Cache size (Kbytes)  
Logical cylinders  
5,397 ± 0.5% 5,397 ± 0.5%  
512  
512  
13,328  
6,536  
512  
13,328  
6,536  
512  
Physical cylinders  
Bytes per sector  
Areal density (Mbytes/sq. in)  
Data zones  
928.8  
19  
928.8  
19  
Recording density, max (BPI)  
Track density (TPI)  
138,011  
6,730  
138,011  
6,730  
Note. See Figure 8 on page 37 and Figure 9 on page 38 for PIO timing  
specifications. See Figure 10 on page 39 and Figure 11 on page  
40 for DMA timing specifications.  
Medalist Pro 6450/6451 Product Manual, Rev. B  
7
1.4 Physical dimensions  
The mounting dimensions are shown in Figure 6 on page 23.  
Height, max  
Width, max  
Depth, max  
Weight  
1.027 inch (26.09 mm)  
4.025 inches (102.2 mm)  
5.787 inches (146.99 mm)  
1.5 lb (0.68 Kg)  
1.5 Seek time  
Seek value is the interval between the time the actuator begins to move  
and the time the head has settled over the target track. Seek time is a  
true statistical average of at least 10,000 measurements of seek time.  
All measurements are taken under nominal conditions of temperature  
and voltage with the drive mounted horizontally. The specifications in the  
table below are defined as follows:  
Track-to-track seek time is the average of all possible single-track  
seeks in both directions.  
Average seek time is measured by executing seeks in both directions  
between random cylinders.  
Full-stroke seek time is half the time needed to seek from track 0 to  
the maximum track and back to track 0.  
Track-to-track  
seek time (typ) seek time  
Average/typical Full-stroke  
Average  
latency  
seek time (typ)  
2.0 msec seek  
2.5 msec read  
3.5 msec write  
9.5 msec read  
20.0 msec seek  
10.0 msec write 22.0 msec read  
23.5 msec write  
5.58 msec  
Note. Host overhead varies between systems and cannot be specified.  
Drive internal overhead is measured by issuing a no-motion seek.  
Overhead is typically less than 0.5 msec.  
1.6 Multisegmented cache buffer  
The Medalist Pro ST36450A and ST36451A drives are available with a  
512-Kbyte, multisegmented cache buffer that improves performance by  
reducing access times.  
Read look-ahead. The drive uses the read segments to store additional  
logical sectors, after the last requested sector, into a buffer before the  
computer requests the additional sectors. The cache buffer stores data  
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Medalist Pro 6450/6451 Product Manual, Rev. B  
from the start of a read until the buffer segment is full or until another  
command is received.  
Write immediate. The drive uses the write segment to store write  
commands and data. After the drive receives all of the data for the  
command, it issues a write complete. Then, the drive writes the data to  
the disc.  
Write merging. The drive accepts contiguous write commands and  
executes them as one command.  
1.7 Start and stop times  
Within 20 seconds after power is applied, the drive is ready. Within 15  
seconds after power is removed, the drive spindle stops rotating.  
1.8 Typical power-up and power-down sequence  
This section describes typical power-up and power-down sequences to  
assist you in evaluating the drive’s performance. They are not perform-  
ance specifications. A typical startup current profile is shown in Figure 1.  
Startup current profiles are unique for each drive.  
Current (Amps)  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0
0
2
4
6
8
10 12 14 16 18  
Time (seconds)  
Figure 1. Typical startup current profile  
Medalist Pro 6450/6451 Product Manual, Rev. B  
9
1.9 Power-up sequence  
1. Power is applied to the drive.  
2. When power is applied, the LED stays on for about 1 second.  
3. The spindle motor reaches operating speed in about 4 seconds.  
4. The magnetic actuator-lock releases the actuator.  
5. The drive achieves final speed-control lock.  
6. The heads position over track 0 and the drive is ready.  
1.9.1 Power-down sequence  
Caution. Do not move the drive until the motor has come to a complete  
stop.  
1. The power is turned off.  
2. Within 15 seconds, the drive spindle stops rotating.  
3. The read/write heads automatically move to the landing zone, which  
is inside the maximum data cylinder.  
4. The magnetic actuator-lock mechanism locks the arm. This completes  
the power-down sequence.  
1.10 Auto-park  
During power-down, the read/write heads automatically move to the  
landing zone. The heads park inside the maximum data cylinder and the  
magnetic actuator-lock engages. When power is applied, the heads  
recalibrate to track 0.  
1.11 Power specifications  
1.11.1 Power management  
The drive supports Active, Idle and Standby power-management modes.  
The power-management commands the drive supports are listed in the  
table on page 27. The table on page 11 shows the typical power  
consumption rates for each power-management mode. The test criteria  
for each mode is defined below. The Idle and Standby timers are disabled  
at the factory.  
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Medalist Pro 6450/6451 Product Manual, Rev. B  
All measurements were taken at the drive power connector. A true RMS  
meter is used to measure all modes except Standby. A DMM is used for  
Standby measurements.  
1.11.1.1 Active mode  
During the Active mode, the drive is involved in spinup, seeking or  
read/write activities. The table on page 11 shows the typical power-con-  
sumption rates for these activities.  
Spinup. The drive enters the Spinup mode from the Standby mode  
and brings the spindle and discs up to operating speed. Power in this  
mode is defined as the peak power after starting spinup.  
Seek. The drive enters the Seek mode from the Idle mode. The  
read/write heads are moved to a specific location on the disc surface  
in preparation for reading from or writing to the disc. Read/write  
electronics are powered down but servo electronics are active. Typical  
power is defined as the power average of executing random seeks  
with a 2-revolution (22.2 msec) dwell between Seek commands.  
Read/write. Read/write mode is entered from Idle mode. Read/write  
electronics are activated and the servo is on track. The drive reads  
from or writes to the disc.  
1.11.1.2 Idle mode  
The Idle mode is entered 1 minute after the last disc I/O activity. The  
motor is up to speed and the actuator is repositioned once every minute.  
This mode uses an algorithm that minimizes head media interface  
stresses. The drive can enter Idle mode fromeither Active orStandby mode.  
1.11.1.3 Standby mode  
The spindle is stopped, the heads are parked in the landing zone, the  
actuator is latched and some of the drive electronics are powered down.  
Note. When recovering from Standby or Sleep mode, you must allow  
the drive to post ready before reporting a timeout. The drive can  
take up to 20 seconds to post ready. In a master and slave  
configuration, the master can wait up to 31 seconds for the slave  
to complete diagnostics before posting ready.  
1.11.1.4 Sleep mode  
The sleep mode implementation is the same as in Standby mode.  
Medalist Pro 6450/6451 Product Manual, Rev. B  
11  
1.11.2 Power consumption  
In the table below, the values apply at the drive power connector. Current  
was measured with an RMS DC ammeter.  
Read/  
write  
Spinup Seek  
Idle  
Standby  
Current at +12V  
Amps max  
3.0A  
0.50  
6.0  
RMS amps typ  
Watts typ  
0.68  
8.1  
0.50  
6.0  
0.02  
0.25  
Current at +5V  
RMS amps typ  
Watts typ  
0.36  
1.8  
0.36  
1.8  
0.36  
1.8  
0.35  
1.75  
Power  
Total watts typ  
9.8W  
7.8W  
7.8W  
2.0W  
1.12 Input noise  
+5V  
+12V  
Voltage tolerance  
(including noise)  
± 5%  
± 5%  
Input noise frequency  
(max)  
25 MHz  
100 mV  
25 MHz  
240 mV  
Input noise  
(max, peak-to-peak)  
1.13 Environmental specifications  
1.13.1 Ambient temperature  
°
°
°
°
5 to 55 C (41 to 122 F)  
Operating  
°
°
°
°
Nonoperating  
–40 to 70 C (–40 to 158 F)  
Note. The system must provide sufficient airflow to maintain a  
°
surface temperature of the aluminum base below 60 C.  
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Medalist Pro 6450/6451 Product Manual, Rev. B  
1.13.2 Temperature gradient  
°
°
Operating  
20 C per hour (36 F per hour)  
°
°
Nonoperating  
25 C per hour (45 F per hour)  
1.13.3 Altitude  
Operating  
–1,000 ft. to 10,000 ft. (–305 m to 3,048 m)  
–1,000 ft. to 40,000 ft. (–305 m to 12,192 m)  
Nonoperating  
1.13.4 Relative humidity  
Operating  
8% to 80% noncondensing  
Maximum wet bulb 29.4 C (85 F)  
°
°
Maximum operating  
gradient  
10% per hour  
Nonoperating  
5% to 95% noncondensing  
Maximum wet bulb 35 C (95 F)  
°
°
1.14 Shock and vibration  
All shock and vibration specifications apply when the drive is mounted  
as recommended in Section 2.5 on page 22, with the input levels  
measured at the drive mounting screws. Shock measurements are based  
on an 11 msec, half sine wave shock pulse, not to be repeated more than  
twice per second.  
During normal operating shock and vibration, there is no physical dam-  
age to the drive or performance degradation. During nonoperating shock  
and vibration, the read/write heads are positioned in the landing zone.  
During abnormal operating shock and vibration, there is no physical  
damage to the drive, although performance may be degraded during the  
shock or vibration episode. When normal operating shock levels resume,  
the drive meets its performance specifications.  
Operating  
Abnormal  
Nonoperating  
Shock  
2 Gs  
10 Gs  
75 Gs  
5–22 Hz vibration  
0.020-inch  
0.081-inch  
displacement  
displacement  
22–350 Hz vibration 0.50 Gs  
2.00 Gs  
Medalist Pro 6450/6451 Product Manual, Rev. B  
13  
1.15 Acoustics  
This table shows the overall A-weighted acoustic sound powerand sound  
pressure levels for the drives. All measurements are generally consistent  
with ISO document 7779. Acoustic measurements are taken under  
essentially free-field conditions over a reflecting plane. The drive is  
oriented with the top cover up for all tests.  
Overall A-weighted Value  
Idle  
3.6  
4.0  
Seek  
4.3  
Sound power, typ (bels)  
4.4  
Sound power, max (bels)  
Sound pressure, typ (dBA)  
Sound pressure, max (dBA)  
30  
33  
34  
34  
1.16 Reliability  
Read error rates are measured with automatic retries and data correction  
with ECC enabled and all flaws reallocated. The mean time between  
failures (MTBF) is measured at nominal power at sea level and an  
ambient temperature of 25°C.  
Nonrecoverable read errors  
Seek errors  
1 per 1013 bits transferred  
1 per 107 physical seeks  
30,000 cycles  
Contact start/stops  
MTBF  
300,000 power-on hours  
5 years  
Service life  
1.17 Agency listings  
This drives are listed by agencies as follows:  
Recognized in accordance with UL478 and UL1950  
Certified to CSA C22.2 No. 220-M1986 and CSA C22.2 No. 950  
Certified to VDE 0805/05.90 and EN 60950/1.88 as tested by VDE  
14  
Medalist Pro 6450/6451 Product Manual, Rev. B  
1.18 Electromagnetic Compliance for the European  
Union  
If this model has the CE Marking, it complies with the European Union  
requirements of the Electromagnetic Compatibility Directive 89/336/EEC  
of 03 May 1989 as amended by Directive 92/31/EEC of 28 April 1992  
and Directive 93/68/EEC of 22 July 1993.  
Seagate uses an independent laboratory to confirm compliance to the  
above directives. The drive was tested in a representative system for  
typical applications. The selected system represents the most popular  
characteristics for test platforms. The system configurations include:  
486, Pentium, and PowerPC microprocessors  
3.5-inch floppy disc drives  
Keyboard  
Monitor/display  
Although the test system with this Seagate model complies to the  
directives, we cannot guarantee that all systems will comply. The com-  
puter manufacturer or system integrator shall confirm EMC compliance  
and provide CE Marking for their product. The drive is not meant for  
external use (without properly designed enclosure, shielded I/O cable,  
etc.) and that a terminator should be used on all unused I/O ports.  
1.19 FCC verification  
The Medalist Pro ATAinterface drives are intended to be contained solely  
within a personal computer or similar enclosure (not attached to an  
external device). As such, a drive is considered to be a subassembly  
even when individually marketed to the customer. As a subassembly, no  
Federal Communications Commission authorization, verification or cer-  
tification of the device is required.  
Seagate Technology, Inc. has tested these drives in an enclosure as  
described above to ensure that the total assembly (enclosure, disc  
drives, motherboard, power supply, etc.) does comply with the limits for  
a Class B computing device, pursuant to Subpart J of Part 15 of the FCC  
rules. Operation with noncertified assemblies is likely to result in interfer-  
ence to radio and television reception.  
Radio and television interference. This equipment generates and uses  
radio frequency energy and, if not installed and used in strict accordance  
with the manufacturer’s instructions, may cause interference to radio and  
television reception.  
This equipment is designed to provide reasonable protection against  
Medalist Pro 6450/6451 Product Manual, Rev. B  
15  
such interference in a residential installation. However, there is no  
guarantee that interference will not occur in a particular installation. If this  
equipment does cause interference to radio or television, which can be  
determined by turning the equipment on and off, you are encouraged to  
try one or more of the following corrective measures:  
Reorient the receiving antenna.  
Move the device to one side or the other of the radio or TV.  
Move the device farther away from the radio or TV.  
Plug the equipment into a different outlet so that the receiver and  
computer are on different branch outlets.  
Ifnecessary, you should consultyour dealer or an experienced radio/tele-  
vision technician for additional suggestions. You may find helpful the  
following booklet prepared by the Federal Communications Commission:  
How to Identify and Resolve Radio-Television Interference Problems.  
This booklet is available from the Superintendent of Documents, US  
Government Printing Office, Washington, DC 20402. Refer to publication  
number 004-000-00345-4.  
Note. This digital apparatus does not exceed the Class B limits for radio  
noise emissions from computer equipment as set out in the radio  
interference regulations of the Canadian Department of commu-  
nications.  
Le présent appareil numérique német pas de bruits radioélectri-  
ques dépassant les limites applicables aux appareils numériques  
de Classe B prescrites dans le règlement sur le brouillage ra-  
dioélectrique édicté par le Ministère des Communications du  
Canada.  
16  
Medalist Pro 6450/6451 Product Manual, Rev. B  
Sicherheitsanleitung  
1. Das Gerrät ist ein Einbaugerät, das für eine maximale Umgebung-  
stemperatur von 50°C vorgesehen ist.  
2. Zur Befestigung des Laufwerks werden 4 Schrauben 6-32 UNC-2A  
benötigt. Bei seitlicher Befestigung darf die maximale Länge der  
Schrauben im Chassis nicht mehr als 5,08 mm und bei Befestigung  
an der Unterseite nicht mehr als 5,08 mm betragen.  
3. Als Versorgungsspannugen werden benötigt:  
+5V æ 5% 0.55A  
+12Væ 5% 0.35A (2.0A fur ca. 30 Sek. fur ± 10%)  
4. Die Versorgungsspannung muss SELV entsprechen.  
5. Alle Arbeiten an der Festplatte dürfen nur von ausgebildetem Serv-  
icepersonal durchgeführt werden. Bitte entfernen Sie nicht die Auf-  
schriftenschilder des Laufwerkes.  
6. Der Einbau des Laufwerkes muss den Anforderungen gemäss DIN  
IEC 950 VDE 0805/05.90 entsprechen.  
Medalist Pro 6450/6451 Product Manual, Rev. B  
17  
2.0 Configuring and mounting the drive  
This section contains the specifications and instructions for configuring  
and mounting the drive.  
2.1 Handling and static-discharge precautions  
After you unpack the drive, and before you install it in a system, be careful  
not to damage it through mishandling. Observe the following standard  
handling and static-discharge precautions:  
Caution:  
Keep the drive inits static-shielded bag until you are ready tocomplete  
the installation. Do not attach any cables to the drive while it is in its  
static-shielded bag.  
Before handling the drive, put on a grounded wrist strap, or ground  
yourself frequently by touching the metal chassis of a computer that  
is plugged into a grounded outlet. Wear a grounded wrist strap  
throughout the entire installation procedure.  
Handle the drive by its edges or frame only.  
The drive is extremely fragile—handle it with care. Do not press down  
on the drive top cover.  
Always rest the drive on a padded, antistatic surface until you mount  
it in the computer.  
Do not touch the connector pins or the printed circuit board.  
Do not remove the factory-installed labels from the drive or cover them  
with additional labels. Removal voids the warranty. Some factory-in-  
stalled labels contain information needed to service the drive. Other  
labels are used to seal out dirt and contamination.  
18  
Medalist Pro 6450/6451 Product Manual, Rev. B  
2.2 I/O cable and connector  
The drive uses a 40-pin, male I/O connector with two rows of twenty pins  
each and a notch for keying. Pin 20 is removed for keying purposes. A  
drawing of the I/O connector is shown in Figure 2. Pin 1 is located near  
the 4-pin power connector when the I/O connector is mounted.  
0.100 ± 0.010  
0.230 ± 0.003  
0.235 ± 0.025  
0.70 ± 0.010  
0.025 ± 0.002  
pin 1  
0.025  
± 0.002  
0.100 typ  
0.160  
0.070 ± 0.010  
1.90  
2.00  
Figure 2. ATA interface connector  
The table below lists recommended parts for the mating connector. You  
can use equivalent parts.  
Part  
Description  
40-pin  
3M part number  
3M-3417-7000  
3M-3448-2040  
3M-3365-40  
Connector  
Connector  
Flat cable  
40-pin  
AWG28 (stranded)  
To ensure the integrity of your data, use a 40-connector, nonshielded I/O  
cable with a maximum length of 18 inches (46 centimeters).  
2.3 Power connector  
The drive uses a standard 4-pin, male power connector. We recommend  
the following part number or their equivalents for the mating connector.  
Part  
Description  
Housing  
Part number  
AMP 1-480424-0  
AMP 60619-4  
AMP 6117-4  
Connector  
Connector  
Connector  
Cable  
Pin (loose piece)  
Pin (reel)  
18 AWG  
Medalist Pro 6450/6451 Product Manual, Rev. B  
19  
2.4 Options jumper block  
The options jumper block (J5), shown in Figure 3, is used to configure  
the drives for operation. It is the 8-pin dual header between the I/O  
connector and the power connector. Pin 1 is located next to the power  
connector and is farthest from the printed circuit board. It accepts  
0.1-inch jumpers. The options jumper block is used to:  
Configure the drive for single-drive operation.  
Configure the drive as the master with an ATA-compatible slave.  
Configure the drive as the slave.  
Configure the drive for alternate capacity.  
Configure the drive for cable select.  
Install a remote LED.  
The jumper settings for these options are shown in Figure 4 on page 20.  
The drive is shipped with a spare jumper attached to pins 6 and 8. Use  
this jumper to configure the drive.  
Interface  
connector  
Pin 1  
Pin 1  
(J5)  
Standard  
power connector  
1
2
3
4
Circuit board  
+5V  
+5V return  
+12V return  
+12V  
Figure 3. Connectors  
20  
Medalist Pro 6450/6451 Product Manual, Rev. B  
Options jumper block (J5)  
Spare  
Jumper  
One drive only  
Drive is slave  
Master with an  
ATA-compatible  
slave  
Alternate Capacity  
(AC)  
Cable select  
Remote LED  
connection  
7 5 3 1  
8 6 4  
Figure 4. Configuration Settings  
2
Circuit Board  
2.4.1 Master/slave configuration  
Use the following settings to configure the drive as a master or a slave.  
One drive only. The drive is configured at the factory for single-drive  
operation. No jumpers are required for single-drive operation. The spare  
jumper on pins 6 and 8 does not affect drive operation.  
Drive as slave. Place a jumper on pins 5 and 6.  
Drive as master with an ATA-compatible slave. Place a jumper on  
pins 7 and 8.  
Medalist Pro 6450/6451 Product Manual, Rev. B  
21  
2.4.2 Alternate capacity jumper  
This jumper lowers the drive capacity by setting the default translation to  
4.092 cylinders. Some BIOSs that only auto-detect may require this  
jumper. Place a jumper on pins 1 and 2 of the J5 options jumper block  
to enable this option. When installing this jumper, you may need third-  
party partitioning software to achieve full capacity of the drive.  
2.4.3 Cable-select option  
Computers that use cable-select determine the master and slave drives  
by selecting or deselecting pin 28, CSEL, on the interface bus. Master  
and slave drives are determined by their physical position on the cable.  
The drive plugged into the I/O connector that carries the CSEL signal  
is the master.  
The drive plugged into the I/O connector that does not carry the CSEL  
signal is the slave.  
To configure the drives for computers that use cable select:  
Install jumpers on pins 5 and 6 and pins 7 and 8 as shown in  
Figure 4 on page 20.  
Connect the drives to the cable as shown in Figure 5 on page 22.  
2.4.4 Remote LED connection  
You can connect a remote LED to pins 3(–) and 4(+) of the options jumper  
block (J5). Do not install a shunt jumper on these pins.  
Because the jumper block uses a 0.1-inch connector, you may need to  
replace the current connector. Use Seagate connector part number  
10562-001 or an equivalent.  
22  
Medalist Pro 6450/6451 Product Manual, Rev. B  
Slave  
CSEL not carried  
to pin 28 of  
this connector  
Master  
Pin 28 grounded  
at computer  
Computer  
Figure 5. Connecting cable-selected drives  
2.5 Mounting the drive  
You can mount the drive in any orientation.  
Use the set of mounting guidelines below that are appropriate to the type  
of mounting holes used: either bottom mounting holes or side mounting  
holes. Refer to Figure 6 on page 23 for mounting dimensions.  
Bottom mounting holes. Insert four 6-32 UNC screws into the four  
bottom mounting holes as shown in Figure 6.  
Caution. Do not insert the bottom mounting screws more than  
0.20 inches (6 turns) into the drive frame.  
Side mounting holes. Use four 6-32 UNC screws in four of the six  
available side mounting holes as shown in Figure 6. Use two mounting  
holes on each side of the drive.  
Caution. Do not insert the side mounting screws more than 0.20  
inches (6 turns) into the drive frame. If you use a screw that is  
too long, you risk damaging the drive’s circuit board.  
Medalist Pro 6450/6451 Product Manual, Rev. B  
23  
[3]  
G
K
C
D
[1]  
F
Notes.  
[1]  
E
A
Mounting holes three on each side, 6-32 UNC.  
Max screw length into side of drive 0.15 in. (3.81  
mm). Screw tightening torque 6.0 in-lb (0.675  
NM) max with minimum thread engagement of  
0.12 in. (3.05 mm).  
[2] Mounting holes four on bottom, 6-32 UNC. Max  
screw length into bottom of drive 0.15 in. (3.81  
mm). Screw tightening torque 6.0 in-lb (0.675 NM)  
max with minimum thread engagement of 0.12 in.  
(3.05 mm).  
Power and interface connectors can extend past  
the “A” dimension by 0.040 in. (1.02 mm).  
[3]  
B
[4]  
[5]  
Centerline of pad for Pin 1 of power connector.  
Dimensions to Pin 1 of each connector are  
nominal values.  
J
[4] M  
Dimension Table  
Inches  
Millimeters  
A
B
C
5.74 ± 0.010  
4.00 ± 0.010  
1.00 + 0.021  
– 0.009  
145.80 ± 0.25  
101.60 ± 0.25  
25.40 + 0.53  
– 0.22  
[2]  
D
E
F
2.362 ± 0.010  
0.620 ± 0.020  
4.000 ± 0.010  
0.250 + 0.010  
– 0.005  
60.00 ± 0.25  
15.75 ± 0.50  
101.60 ± 0.25  
6.35 + 0.25  
– 0.12  
H
G
H
J
1.750 ± 0.010  
3.750 ± 0.010  
44.45 ± 0.25  
95.25 ± 0.25  
K
L
M
1.00 ± 0.010  
4.000 ± 0.010  
25.4 ± 0.25  
101.6 ± 0.25  
3.63  
[5]  
K
0.143  
[5]  
L
Figure 6. Mounting dimensions  
24  
Medalist Pro 6450/6451 Product Manual, Rev. B  
Medalist Pro 6450/6451 Product Manual, Rev. B  
25  
3.0 ATA Interface  
The drives use an ATA-3 interface. The interface complies with ANSI  
ATA (AT Attachment) Interface X3T10 Rev. 6.0; SFF 8011: ATA Timing  
Extension for Local Bus Attachments, Rev. 2.0 and SFF 8019: Identify  
drives Data for drives Under 8 GB. The ATA commands that the drives  
support are listed on pages 27 and 28. Commands and features with  
specific applications for these drives are also discussed in this section.  
The ATA interface consists of single-ended, TTL-compatible receivers  
and drivers that use an asynchronous interface protocol. The drivers can  
sink up to 24 mA and drive a load up to 300 pF. The integrity of the ATA  
interface is affected by the interface cable. It is designed to support a  
40-conductor, nonshielded interface cable with a maximum length of 18  
inches (46 centimeters).  
3.1 ATA Interface connector pin assignments  
The signal name and signal direction for each I/O connector pin is shown  
in Figure 7 on page 26. See the Seagate ATA Interface Reference  
Manual, publication number 36111-xxx, for a complete description of  
each pin.  
Signal names are shown in upper-case letters. If the signal name is  
followed by a minus sign (–), the signal is active low. Otherwise, the signal  
is active high.  
26  
Medalist Pro 6450/6451 Product Manual, Rev. B  
Drive  
Host  
1
2
Reset  
1
2
3
4
5
6
7
8
9
Host Reset  
Ground  
Ground  
3
DD7  
Host Data Bus Bit 7  
Host Data Bus Bit 8  
Host Data Bus Bit 6  
Host Data Bus Bit 9  
Host Data Bus Bit 5  
Host Data Bus Bit 10  
Host Data Bus Bit 4  
4
DD8  
5
DD6  
6
DD9  
7
DD5  
8
DD10  
DD4  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
DD11  
DD3  
10 Host Data Bus Bit 11  
11 Host Data Bus Bit 3  
12 Host Data Bus Bit 12  
13 Host Data Bus Bit 2  
14 Host Data Bus Bit 13  
15 Host Data Bus Bit 1  
16 Host Data Bus Bit 14  
17 Host Data Bus Bit 0  
18 Host Data Bus Bit 15  
19 Ground  
DD12  
DD2  
DD13  
DD1  
DD14  
DD0  
DD15  
Ground  
(removed)  
DMARQ  
Ground  
(No Pin)  
20  
21 DMA Request  
22 Ground  
DIOW  
Ground  
23 Host I/O Write  
24 Ground  
DIOR  
25 Host I/O Read  
26 Ground  
Ground  
IORDY  
CSEL  
27 I/O Channel Ready  
28 Cable Select  
DMACK  
Ground  
INTRQ  
29 DMA Acknowledge  
30 Ground  
31 Host Interrupt Request  
32 Host 16 Bit I/O  
33 Host Address Bus Bit 1  
34 Passed Diagnostics  
35 Host Address Bus Bit 0  
36 Host Address Bus Bit 2  
37 Host Chip Select 0  
38 Host Chip Select 1  
39 Drive Active/  
IOCS16  
DA1  
*34  
35  
PDIAG  
DA0  
36  
DA2  
37  
CS1FX  
CS3FX  
38  
DASP  
*39  
Drive 1 Present  
40  
Ground  
40 Ground  
*
Drive-to-drive signals  
Drive 1  
(slave)  
Drive 0  
(master)  
Host  
NC  
28  
34  
39  
28  
34  
39  
CSEL  
28  
34  
39  
PDIAG  
DASP–  
Figure 7. ATA interface connector pin assignments  
Medalist Pro 6450/6451 Product Manual, Rev. B  
27  
3.2 Command set  
This section lists all of the ATA commands the drives use. Only the  
commands with unique implementation for the drives are discussed in  
this manual. For information about the ATA interface, refer to Working  
Draft X3T10.2008D Rev. 6, Information Technology—AT Attachment-3  
Interface ATA-3. Additional information about the drive commands and  
features is provided in the Seagate ATA Interface Reference Manual,  
36311-xxx, Small Form Factor Specification, SFF-8011 Rev 1.1, Sep-  
tember 18, 1993, and Small Form-Factor Committee Specification Draft  
SFF-8055i, January 8,1996, Revision 1.0, Preliminary Document.  
The table below lists all commands that the drives use. The following  
abbreviations are used:  
FR  
Features register  
SC Sector Count register  
SN Sector Number register  
CY  
Cylinder register  
DH Drive/Head register  
n
y
This register does not contain a valid parameter for this  
command.  
This register contains a valid parameter for this command. In  
the Drive/Head register, both the drive and head parameters  
are valid for this command.  
D
The Drive/Head register contains a valid drive parameter for  
this command. The head parameter is not valid for this  
command.  
Note. Read DMA, Read Long, Read Sector, Read Verify Sector, Write  
DMA, Write Long and Write Sector support with retry and without  
retry commands.  
Parameters used  
Command  
Command name  
code (in hex)  
FR SC SN CY DH  
Active and Set Idle Timer  
Active Immediate  
FB  
F9  
n
n
n
n
n
y
n
y
y
n
n
n
n
n
n
n
n
n
n
n
D
D
D
D
D
Check Idle Mode  
FD  
Check Power Mode  
Execute Drives Diagnostic  
continued  
98, E5  
90  
28  
Medalist Pro 6450/6451 Product Manual, Rev. B  
continued from previous page  
Parameters used  
Command  
code (in hex)  
Command name  
FR SC SN CY DH  
Identify drives  
Idle  
EC  
97, E3  
FA  
n
n
n
n
n
n
n
n
n
n
n
n
y
n
y
y
n
y
y
y
y
y
n
y
n
n
n
y
n
n
n
y
y
y
y
n
n
n
n
n
n
y
y
y
y
n
y
n
y
n
n
n
n
n
y
y
y
y
n
n
n
n
n
n
y
y
y
y
n
y
n
y
n
n
n
n
n
y
y
y
y
n
D
D
D
D
y
Idle and Set Idle Timer  
Idle Immediate  
Initialize Drive Parameters  
Read DMA  
95, F8, E1  
91  
C8, C9  
22, 23  
C4  
y
Read Long  
y
Read Multiple  
Read Sector  
Read Sector Buffer  
Read Verify Sector  
Recalibrate  
y
20, 21  
E4  
y
D
y
40, 41  
1X  
D
y
Seek  
7X  
Set Features  
Set Multiple Mode  
Sleep  
EF  
D
D
D
D
D
y
C6  
n
n
n
n
n
n
n
n
99, E6  
96, E2  
94, E0  
CA, CB  
32, 33  
C5  
Standby  
Standby Immediate  
Write DMA  
Write Long  
y
Write Multiple  
Write Sector  
y
30, 31  
E8  
y
Write Sector Buffer  
D
Medalist Pro 6450/6451 Product Manual, Rev. B  
29  
3.2.1 Identify drive command (EC )  
H
The Identify drive parameters for the drives are listed in the table below.  
Note. If the alternate capacity jumper is installed on the drive, the drive  
capacity is reduced in Word 1 to 4,092 cylinders.  
Word  
Description  
Configuration  
Value  
045AH  
0
1
Number of logical  
cylinders  
ST36450A = 13,328  
ST36451A = 13,328  
Reserved  
0000  
2
3
4
5
6
Number of logical heads 15  
Vendor-specific  
Vendor-specific  
34,540  
580  
Number of logical sectors 63  
per track  
Vendor-specific  
0000  
7–9  
Serial number (20 ASCII drive-unique  
characters)  
10–19  
Vendor-specific  
3
20  
21  
Vendor-specific  
896  
ECC bytes (R/W Long)  
0004H  
22  
Firmware revision  
(8 ASCII characters)  
drive-unique  
23–26  
Model number (40 ASCII ST36450A  
27–46  
characters)  
Vendor-specific  
Reserved  
ST36451A  
8010H  
0000  
47  
48  
49  
50  
51  
Capabilities  
Reserved  
0B01H  
0000  
PIO data-transfer cycle  
timing mode  
0200H  
Obsolete  
0200H  
52  
continued  
30  
Medalist Pro 6450/6451 Product Manual, Rev. B  
continued from previous page  
Word  
Description  
Current valid  
Value  
53  
ST36450A  
0003H  
0001H words 54–58 and  
64–70 are valid  
0007H words 54–58, 64–70  
and 85–85 are valid  
ST36451A  
Number of current logical ST36450A = 13,328  
cylinders ST36451A = 13,328  
54  
55  
Number of current logical 15  
heads  
Number of current  
sectors  
63  
56  
Current capacity in  
sectors (CHS)  
ST36450A = 12,594,960  
ST36451A = 12,594,960  
57–58  
59  
xxH= Current setting for  
number of sectors that  
can be transferred per  
interrupt on Read/Write  
Multiple command  
0000s  
Total number of user-  
addressable LBA sectors ST36451A = 12,594,960  
ST36450A = 12,594,960  
60–61  
Obsolete  
0000  
62  
63  
Multiword DMA transfer  
mode active  
0107H  
Mode 0 is active  
Modes 0, 1, and 2 supported  
Advanced PIO transfer  
mode supported  
0003H  
64  
65  
Modes 3 and 4 supported  
Minimum multiword DMA 120 nsec  
transfer cycle time per  
word  
Manufacturer  
recommended multiword  
DMA transfer cycle time  
120 nsec  
66  
67  
Minimum PIO transfer  
cycle time without flow  
control  
120 nsec  
Medalist Pro 6450/6451 Product Manual, Rev. B  
31  
Word  
Description  
Value  
Minimum PIO transfer  
with IORDY flow control  
120 nsec  
68  
Reserved  
0000  
69–79  
80  
Major version number  
000EH  
supports ATA-3  
supports ATA-2  
supports ATA-1  
Minor version number  
Command set support  
0000  
81  
82  
ST36450A = 0000  
ST36451A = 7069H  
Command set support  
ST36450A = 0000  
ST36451A = 4000H  
83  
84  
Command set/feature  
supported extension  
0
0
0
Command set/feature  
enabled  
85–86  
87  
Command set/feature  
default  
Ultra DMA mode  
ST36450A = 0000  
ST36451A = 0007H  
88  
Reserved  
89–127  
128  
Security status  
Vendor-specific  
Reserved  
0000  
129–159  
160–255  
32  
Medalist Pro 6450/6451 Product Manual, Rev. B  
3.2.2 Set Features command (EF )  
H
The Set Features command (command code EFH) allows you to enable  
and disable the multisegmented cache and Automatic Reallocation  
features and to identify the transfer modes the drives use. The multiseg-  
mented buffer consists of Read Look-ahead and write-immediate and  
write-merging features. The table below lists the features the drives  
support. The features that are set to default by the factory are indicated  
in the Feature column.  
To use the command:  
1. Write the Feature value to the Features register.  
2. Write the Set Features command to the command register.  
Note. If the value in the Features register is not supported or is invalid,  
the drives post an Aborted Command error.  
At power-on or after a hard reset, the feature selections are restored to  
the factory-default values.  
The table below shows alterable features that the drives support. Values  
that are preset at the factory are indicated as default in the feature  
description.  
Feature Value  
Feature  
02H  
03H  
04H  
55H  
82H  
84H  
AAH  
Enable write cache (default)  
Set transfer mode  
Enable Read Automatic Reallocation (default)  
Disable read look-ahead cache  
Disable write cache  
Disable Read Automatic Reallocation  
Enable read look-ahead cache (default)  
Medalist Pro 6450/6451 Product Manual, Rev. B  
33  
3.2.2.1 PIO and DMA Data-Transfer Modes  
You can set the multiword DMA mode and identify the PIO data-transfer  
mechanism and transfer mode with the Set Features command. To set  
the multiword DMA mode:  
1. Write Set Features command value 03H (Set Data Transfer mode) to  
the Features register.  
2. Write a transfer types value to the Sector Count register. The upper 5  
bits of this value define the type of data transfer, and the lower 3 bits  
encode the mode value. This changes word 63 of the Identify Drive  
command to the value you enter in the Sector Count register.  
The following table identifies allowable transfer types values:  
Data-Transfer Mechanism  
Transfer Types value  
Mode  
Data  
Mechanism name  
Lower 3 bits  
value Upper 5 bits  
PIO Transfer Mode (default)  
2
00000  
000  
001  
PIO Transfer Mode: Disable  
IORDY Set PIO Mode = 2  
2
00000  
PIO Flow Control Transfer  
Mode: Set PIO Mode = 0  
0
1
2
3
4
00001  
00001  
00001  
00001  
00001  
000  
001  
010  
011  
100  
PIO Flow Control Transfer  
Mode: Set PIO Mode = 1  
PIO Flow Control Transfer  
Mode: Set PIO Mode = 2  
PIO Flow Control Transfer  
Mode: Set PIO Mode = 3  
PIO Flow Control Transfer  
Mode: Set PIO Mode = 4)  
Obsolete  
00010  
00100  
00100  
00100  
01000  
10000  
nnn  
000  
001  
010  
nnn  
nnn  
Multiword DMA Mode  
Multiword DMA Mode  
Multiword DMA Mode  
Synchronous DMA Mode  
Reserved  
0
1
2
Note. If the drive does not support a commanded mode, it returns a 04  
aborted command error.  
34  
Medalist Pro 6450/6451 Product Manual, Rev. B  
3.2.3 Standby timer timeout period  
The Idle command and Standby command Sector Count registers are  
used to activate the Standby timer. The host can enable the Standby  
timer by placing a value in the sector-count register of the Idle command  
or Standby command. The value corresponds to a predetermined period  
of drive inactivity. The table below lists the values the Seagate drives use  
and their corresponding timeout period.  
Sector Count Register contents  
0 (0H)  
Corresponding timeout period  
Timeout disabled  
value = 60 seconds  
(value * 5) seconds  
(value – 240 * 30) minutes  
21 minutes  
1–12 (1H–CH)  
13–240 (DH–F0H)  
241–251 (F1H–FBH)  
252 (FCH)  
253 (FDH)  
8 hours  
254 (FEH)  
Reserved  
255 (FFH)  
21 minutes 15 seconds  
The drives are shipped with the Standby timer disabled.  
3.2.4 Sleep command (99 , E6 )  
H
H
This command performs the same function as the Standby Immediate  
command (94H, E0H).  
3.2.5 Automatic Reallocation  
This feature allows the drive to identify grown media defects and to  
reallocate the sector without host intervention using both Read and Write  
Automatic Reallocation.  
You can disable Read Reallocation by using the Set Features command  
Disable Read Automatic Reallocation, feature value 84H. This feature is  
not used for the Read Long command.  
You can disable The Write Reallocation, in addition to write cache by  
using the Set Feature command Disable Write Cache, feature value 82H.  
This feature is not implemented for the Write Long command.  
Medalist Pro 6450/6451 Product Manual, Rev. B  
35  
You can disable both the Write Reallocation and write cache using value  
82H. These two features coexists as a pair and are enabled/disabled  
together.  
3.3 Synchronous DMA Transfer  
3.3.1 Signal Line Definitions  
Some existing ATA signal lines are redefined during the Synchronous  
DMA protocol to provide new functions. If the Synchronous DMA transfer  
mode was previously chosen by the Set Features, the ATA lines change  
from the old to new definitions as soon as the host allows for a DMA  
burst. The drive detects this change when the –DMACK line is asserted.  
These lines revert back to their original definitions upon the de-assertions  
of –DMACK at the termination of the DMA burst.  
Signal Line Definitions  
New Definitions  
DMARQ  
Old Definitions  
DMARQ  
–DMACK  
–DMACK  
–DMACK  
IORDY on write commands  
–DIOR on read commands  
STROBE  
STOP  
–DIOR on write commands  
IORDY on read commands  
–DIOW  
Note. DMARQ and –DMACK signal lines remain unchanged. This en-  
sures backward-compatibility with PIO modes.  
3.3.2 Protocol Rules  
The general rules of the Synchronous DMA Transfer Protocol are as  
follows:  
A DMA burst is defined as the period from an assertion of –DMACK  
to subsequent de-assertion of –DMACK.  
A receiver must be prepared to receive at least two words of data  
whenever it enters or resumes a burst mode.  
36  
Medalist Pro 6450/6451 Product Manual, Rev. B  
During the entire burst, –CS0, –CS1, and –IOCS16 are in the high  
negated state. DA2, DA1 and DA0 are driven low.  
The drive begins driving and stops tristating IORDY when –DMACK  
is first asserted and SyncDMA is enabled. The drive must continue to  
drive IORDY until –DMACK is de-asserted and then tristates IORDY  
within (Tiordyz) nanoseconds.  
A device thatsupports a particular mode timing must support all slower  
modes  
3.3.3 Error Register  
Field/Bit Description  
Bit  
7
6
5
4
3
2
1
0
ICRCE UNC  
MC IDNF MCR ABRT TKONF AMNF  
ICRCE (Interface CRC Error) indicates that a CRC error occurred on  
the data bus during a Synchronous DMA transfer. The correct re-  
sponse for this error is to retry the complete command. ABRT (bit 2)  
is also set to ensure compatibility with drivers designed for previous  
versions of the Synchronous DMA Transfer Protocol Specification.  
ABRT (Aborted Command) indicates that the requested command  
was aborted because the command code or a command parameter  
was invalid, or some other error occurred. The device may complete  
some portion of the command before setting ABRT and terminating  
the command. If the command was a data-transfer command, the data  
transfer is determinate. This bit is also set when an Interface CRC  
Error (bit 7) occurs. This ensures compatibility with drivers designed  
for previous versions of the Synchronous DMA Protocol Specification.  
Medalist Pro 6450/6451 Product Manual, Rev. B  
37  
Appendix. Timing diagrams  
Without IORDY, the drives operate at programmed I/O timing specifica-  
tions, as shown below.  
Address valid  
DIORand DIOW−  
Write data valid  
Read data valid  
IOCS16−  
T7  
T5  
T3  
T6  
T4  
T1  
T2  
T9  
T8  
T0  
Figure 8. Programmed I/O timing without IORDY  
Time  
Description  
Min  
Max  
T0 Cycle time  
200 nsec  
30 nsec  
Drives address (CS1FX–, CS3FX–,  
DA0, DA1 and DA2) valid and  
DIOR– and DIOW setup  
T1  
T2 DIOW– or DIOR– pulse width  
T3 DIOW– data setup  
T4 DIOW– data hold  
80 nsec  
30 nsec  
15 nsec  
20 nsec  
5 nsec  
T5 DIOR– data setup  
T6 DIOR– data hold  
T7 DIOW– or DIOR– to address valid hold  
T8 DIOW– false to write data hold  
T9 DIOR– false to read data hold  
40 nsec  
30 nsec  
10 nsec  
38  
Medalist Pro 6450/6451 Product Manual, Rev. B  
When using IORDY, the drives operate at programmed timing specifica-  
tions, as shown below.  
Address valid  
IOCS16−  
DIORor DIOW−  
IORDY  
Write data valid  
Read data valid  
T1  
T2  
T7  
T6  
T8  
T9  
T3  
T5  
T4  
T10 T11  
T0  
Figure 9. Programmed I/O timing with IORDY  
Time  
Description  
Min  
Max  
T0 Cycle time  
120 nsec  
T1 Address valid until IOCS16– is asserted  
30 nsec  
Drive address (CS1FX–, CS3FX–,  
DA0, DA1 and DA2) valid before DIOR–  
or DIOW– setup  
T2  
25 nsec  
T3 IORDY setup time  
DIOW– or DIOR– pulse width (8-bit)  
T4  
70 nsec  
70 nsec  
DIOW– or DIOR– pulse width (16-bit)  
1,250  
nsec  
T5 IORDY pulse width  
T6 DIOW– data setup  
20 nsec  
20 nsec  
5 nsec  
10 nsec  
5 nsec  
T7 DIOR– data setup  
T8 DIOR– data hold  
T9 DIOW– data hold  
T10 DIOW– or DIOR– to address valid hold  
T11 Address valid until IOCS16– is negated  
25 nsec  
Medalist Pro 6450/6451 Product Manual, Rev. B  
39  
The drives operate at multiword DMA mode 2 timing specifications, as  
shown below  
DMARQ  
DMACK−  
DIORor DIOW−  
Read data valid  
Write data valid  
TE  
TF  
TG TH  
TL  
TI  
TD  
TK  
TJ  
T0  
Figure 10. Multiword DMA timing  
Time  
Description  
Min  
120 nsec  
70 nsec  
Max  
T0 Cycle time  
TD DIOW– or DIOR– pulse width (16-bit)  
TE DIOR– data access  
TF DIOR– data hold  
5 nsec  
20 nsec  
10 nsec  
0 nsec  
5 nsec  
25 nsec  
25 nsec  
TG DIOW– data setup  
TH DIOW– data hold  
TI DMACK– to DIOR– or DIOW– setup  
TJ DIOR– or DIOW– to DMACK– hold  
TKR DIOR– negated pulse width  
TKW DIOW– negated pulse width  
TLR DIOR– to DMARQ delay  
TLW DIOW– to DMARQ delay  
35 nsec  
25 nsec  
40  
Medalist Pro 6450/6451 Product Manual, Rev. B  
The dives operates at sustained synchronous DMA burst timing specifi-  
cations, as shown below.  
Strobe at  
Sender  
Data at  
Sender  
Tdvs  
Tdvs  
Tdvh  
Tcyc  
Tdvh  
Tcyc  
T2cyc  
Tdvh  
T2cyc  
Strobe at  
Receiver  
Data at  
Receiver  
Tds  
Tds  
Tdh  
Tdh  
Tdh  
Figure 11. Sustained Synchronous DMA burst  
Time  
Description  
Mode 0  
114 nsec  
235 nsec  
Mode 1  
75 nsec  
156 nsec  
Mode 2  
Tcyc Cycle time  
55 nsec  
T2cyc Two cycle times  
117 nsec  
Data setup time  
Tds  
15 nsec  
5 nsec  
70 nsec  
6 nsec  
10 nsec  
5 nsec  
48 nsec  
6 nsec  
7 nsec  
5 nsec  
34 nsec  
6 nsec  
(at receiver)  
Data hold time  
Tdh  
(at receiver)  
Data valid setup  
Tdvs  
time (at sender)  
Data valid hold time  
Tdvh  
(at sender)  
Note. Mode values show the minimum time only.  
Seagate Technology, Inc.  
920 Disc Drive, Scotts Valley, California 95066, USA  
Publication Number: 32652-001, Rev. B, Printed in USA  

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