Seagate MARATHON 2250 User Manual

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Marathon 2250  
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Marathon 1680  
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ATA Interface Drives  
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Product Manual  
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Marathon 2250 (ST92255AG)  
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Marathon 1680 (ST91685AG)  
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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: 36337-101, Rev. B, March 1997  
Seagate, Seagate Technology and the Seagate logo are registered  
trademarks of Seagate Technology, Inc. Marathon and SafeRite are  
trademarks of Seagate Technology. Other product names are registered  
trademarks or 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.  
Marathon 2250 and Marathon 1680 Product Manual  
iii  
Contents  
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1  
Specification summary table . . . . . . . . . . . . . . . . . . . 2  
1.0 Drive specifications . . . . . . . . . . . . . . . . . . . . . . 5  
1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . 5  
1.1.1 Default logical geometry . . . . . . . . . . . . . . . . 5  
1.1.2 Supported CHS translation geometries . . . . . . . . 5  
1.2 Physical organization . . . . . . . . . . . . . . . . . . . . 6  
1.3 Recording and interface technology . . . . . . . . . . . . . 6  
1.4 Physical characteristics . . . . . . . . . . . . . . . . . . . 7  
1.5 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
1.6 Start times . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
1.7 Power specifications . . . . . . . . . . . . . . . . . . . . . 8  
1.7.1 Power consumption . . . . . . . . . . . . . . . . . . 8  
1.7.2 Power recovery . . . . . . . . . . . . . . . . . . . . . 9  
1.7.3 Conducted noise . . . . . . . . . . . . . . . . . . . . 9  
1.7.4 Voltage tolerance . . . . . . . . . . . . . . . . . . . . 10  
1.7.5 Power-management modes . . . . . . . . . . . . . . 10  
1.8 Environmental tolerances . . . . . . . . . . . . . . . . . . 12  
1.8.1 Ambient temperature . . . . . . . . . . . . . . . . . . 12  
1.8.2 Temperature gradient . . . . . . . . . . . . . . . . . 12  
1.8.3 Humidity . . . . . . . . . . . . . . . . . . . . . . . . 12  
1.8.4 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . 12  
1.8.5 Shock . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
1.8.6 Vibration . . . . . . . . . . . . . . . . . . . . . . . . 13  
1.9 Drive acoustics . . . . . . . . . . . . . . . . . . . . . . . 14  
1.10 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . 14  
1.11 Agency certification . . . . . . . . . . . . . . . . . . . . 15  
1.11.1 Safety certification . . . . . . . . . . . . . . . . . . 15  
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Marathon 2250 and Marathon 1680 Product Manual  
1.11.2 Electromagnetic Compatibility . . . . . . . . . . . . 15  
1.11.3 FCC verification . . . . . . . . . . . . . . . . . . . . 15  
2.0 Drive mounting and configuration . . . . . . . . . . . . . . 17  
2.1 Handling and static-discharge precautions . . . . . . . . . 17  
2.2 Jumper settings . . . . . . . . . . . . . . . . . . . . . . . 17  
2.2.1 Master/slave configuration . . . . . . . . . . . . . . . 17  
2.3 Remote LED configuration . . . . . . . . . . . . . . . . . 19  
2.4 Drive mounting . . . . . . . . . . . . . . . . . . . . . . . 19  
2.5 ATA interface connector . . . . . . . . . . . . . . . . . . . 23  
3.0 ATA Attachment-3 Interface (ATA-3) . . . . . . . . . . . . . 25  
3.1 ATA interface signals and connector pins . . . . . . . . . . 25  
3.1.1 AT bus signal levels . . . . . . . . . . . . . . . . . . 25  
3.2 ATA Interface commands . . . . . . . . . . . . . . . . . . 27  
3.2.1 Supported ATA commands . . . . . . . . . . . . . . . 27  
3.2.2 Identify Drive command . . . . . . . . . . . . . . . . 29  
3.2.3 Set Features command . . . . . . . . . . . . . . . . 32  
3.2.4 S.M.A.R.T. commands . . . . . . . . . . . . . . . . . 34  
3.2.5 Drive Security commands . . . . . . . . . . . . . . . 35  
Appendix. Compatibility Notes . . . . . . . . . . . . . . . . . . 37  
Marathon 2250 and Marathon 1680 Product Manual  
v
Figures  
Figure 1. Typical startup and operation current profile. . . . . . . . 9  
Figure 2. Connector and master/slave jumper setup . . . . . . . . 18  
Figure 3. Drive mounting dimensions—side and bottom view. . . . 20  
Figure 4. Drive mounting dimensions—end view . . . . . . . . . . 21  
Figure 5. ATA Interface connector dimensions . . . . . . . . . . . 23  
Figure 6. I/O pins and supported ATA signals . . . . . . . . . . . 26  
vi  
Marathon 2250 and Marathon 1680 Product Manual  
Marathon 2250 and Marathon 1680 Product Manual  
1
Introduction  
The Marathon 2250 (ST92255AG) and Marathon 1680 (ST91685AG)  
provide very high storage capacity in a small, 17-mm hard disc drive.  
Key Features:  
Low power consumption  
Compact, SFF-8200-compatible form-factor  
High rotational speed for fast internal data transfer  
Quiet operation  
SafeRite shock protection  
Support for PIO modes 0, 1, 2, 3 and 4, as well as single-word and  
multiword DMA modes 0, 1 and 2  
High instantaneous (burst) data-transfer rates (up to 16.6 Mbytes per  
second) using PIO mode 4 and DMA mode 2  
103-Kbyte adaptive multisegmented cache  
Fast caching and on-the-fly error-correction algorithms  
Fast microprocessor for low command overhead  
Support for S.M.A.R.T. drive monitoring and reporting  
Support for drive password security  
Support for Read/Write Multiple commands  
Support for autodetection of master/slave drives using cable-select  
(CSEL) and DASP– signals  
2
Marathon 2250 and Marathon 1680 Product Manual  
Specification summary table  
The specifications listed in this table are for quick reference. For details  
on a specification measurement or definition, see the appropriate section  
of this manual.  
Marathon  
2250  
Marathon  
1680  
Drive Specification  
Guaranteed Mbytes (1 Mbyte=106 bytes)  
Guaranteed sectors (LBA mode)  
Bytes per sector  
2,250  
1,680  
4,394,940  
3,282,490  
512  
Default sectors per track  
63  
16  
63  
16  
Default read/write heads  
Default cylinders  
4,360  
10  
3,256  
8
Physical read/write heads  
Discs  
5
4
Recording density (bits/inch, max)  
Track density (tracks/inch)  
Areal density (Mbits/inch2)  
Spindle speed (RPM)  
120,000  
5,555  
666  
4,508  
60.8  
Internal data-transfer rate (Mbits/sec max)  
I/O data-transfer rate (Mbytes/sec max)  
ATA data-transfer modes supported  
16.6  
PIO modes 0, 1, 2, 3, 4 and  
multiword DMA modes 0, 1, 2  
Cache buffer (Kbytes)  
103  
17.2  
Height (mm max)  
Width (mm max)  
70.1  
Length (mm max)  
100.45  
Weight (grams typical)  
204  
200  
Track-to-track seek time (msec typical)  
Average seek time (msec typical)  
Full-stroke seek time (msec max)  
Average latency (msec)  
4 (read), 5 (write)  
12 (read), 14 (write)  
26 (read), 28 (write)  
6.65  
Marathon 2250 and Marathon 1680 Product Manual  
3
Marathon  
Marathon  
1680  
Drive Specification  
2250  
Power-on to ready (sec typical)  
Standby to ready (sec typical)  
3.5  
2
Spinup current (peak)  
1.3 amps  
2.5 watts, 0.5 amps  
2.5 watts, 0.5 amps  
1.2 watts, 0.24 amps  
0.3 watts, 0.06 amps  
0.1 watts, 0.02 amps  
+5 volts, ± 5%  
Read/Write power and current (typical)  
Seek power and current (typical)  
Idle mode power and current (typical)  
Standby mode power and current (typical)  
Sleep mode power and current (typical)  
Voltage tolerance (including noise)  
Ambient temperature (°C)  
5 to 55 (op.), –40 to 70 (nonop.)  
30  
Temperature gradient (°C per hour max)  
Relative humidity (operating)  
8% to 80%  
(10% per hour max grad.)  
Wet bulb temperature (°C max)  
29.4 (op.), 40 (nonop.)  
Altitude (meters above mean sea level,  
max)  
–300 to 3,040 (op.),  
–300 to 12,190 (nonop.)  
Shock, operating (Gs max)  
125 (2 msec)  
350  
Shock, nonoperating (Gs max, 2 msec)  
Vibration (Gs max at 5–400 Hz,  
0.75 (op.)  
without physical damage or loss of data)  
4.0 (nonop.)  
Drive acoustics (bels—sound power)  
3.5 (typical), 3.8 (max)  
24 (typical), 28 (max)  
Idle mode  
(dBA—sound pressure)  
Drive acoustics (bels—sound power )  
Seek mode (dBA—sound pressure)  
3.8 (typical), 4.1 (max)  
26 (typical), 30 (max)  
Nonrecoverable read errors  
1 per 1013 bits read  
Mean time between failures  
(power-on hours)  
300,000  
Contact start-stop cycles  
(40°C, ambient humidity)  
50,000  
5
Service life (years)  
4
Marathon 2250 and Marathon 1680 Product Manual  
Marathon 2250 and Marathon 1680 Product Manual  
5
1.0 Drive specifications  
Unless otherwise noted, all specifications are measured under ambient  
conditions, at 40°C, at sea level and nominal power.  
1.1 Formatted capacity  
Marathon 2250  
Marathon 1680  
Guaranteed Kbytes  
2,250,209  
1,680,634  
Guaranteed sectors  
(LBA mode)  
4,394,940  
512  
3,282,490  
512  
Bytes per sector  
Note. DOS systems are not able to access more than 528 Mbytes unless:  
1) the host system supports and is configured for LBA addressing  
or for extended CHS addressing, or 2) the host system contains a  
specialized drive controller, or 3) the host system runs BIOS trans-  
lation software. In addition, older BIOSs cannot address more than  
2.1 Gbytes (more than 4,096 cylinders) on a single partition. If you  
encounter this problem with the ST92255AG, divide the drive into  
two partitions or upgrade your BIOS. Please contact your Seagate  
representative for additional information.  
1.1.1 Default logical geometry  
Marathon 2250  
Marathon 1680  
CHS Mode  
Sectors per track  
Read/write heads  
Cylinders  
63  
63  
16  
16  
4,360  
3,256  
LBA Mode  
When addressing either drive in LBA mode, all blocks (sectors) are  
consecutively numbered from 0 to n – 1.  
1.1.2 Supported CHS translation geometries  
The Marathon 2250 supports any translation geometry that satisfies all  
of the following conditions:  
Sectors per track 63  
Read/write heads 16  
(Sectors per track) × (read/write heads) × (cylinders) 4,394,880  
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Marathon 2250 and Marathon 1680 Product Manual  
The Marathon 1680 supports any translation geometry that satisfies all  
of the following conditions:  
Sectors per track 63  
Read/write heads 16  
(Sectors per track) × (read/write heads) × (cylinders) 3,282,048  
1.2 Physical organization  
Marathon 2250 Marathon 1680  
Read/Write heads  
Discs  
10  
5
8
4
1.3 Recording and interface technology  
Interface  
ATA  
Recording method  
8/9  
Recording density (bits/inch)  
Track density (tracks/inch)  
Areal density (Mbits/inch2)  
120,000  
5,555  
666  
Spindle speed (RPM)  
4,508  
( ± 0.5%)  
Internal data-transfer rate  
(Mbits per sec max—ZBR)  
60.8  
I/O data-transfer rate  
(Mbytes per sec max)  
16.6 (PIO mode 4 with IORDY)  
16.6 (multiword DMA mode 2)  
Interleave  
1:1  
Cache buffer (Kbytes)  
103  
Marathon 2250 and Marathon 1680 Product Manual  
7
1.4 Physical characteristics  
Marathon 2250 Marathon 1680  
Maximum height (inches)  
(mm)  
0.676  
(17.2)  
0.676  
(17.2)  
Maximum width  
(inches)  
(mm)  
2.76  
(70.1)  
2.76  
(70.1)  
Maximum length (inches)  
(mm)  
3.955  
(100.45)  
3.955  
(100.45)  
Typical weight  
(ounces)  
(grams)  
7.19  
(204)  
7.05  
(200)  
Note. Maximum length excludes I/O connector pins that may extend up  
to 0.015 inches beyond the edge of the head/disc assembly, per  
SFF 8004 specification.  
1.5 Seek time  
All seek times are measured using a 25 MHz 486 AT computer (or faster)  
with a 8.3 MHz I/O bus. The measurements are taken with nominal power  
at sea level and 40°C ambient temperature. The specifications in the  
table below are defined as follows:  
Track-to-track seek time is an average of all possible single-track  
seeks in both directions.  
Average seek time is a true statistical random average of at least 5,000  
measurements of seeks between random tracks, less overhead.  
Full-stroke seek time is one-half the time needed to seek from the first  
data cylinder to the maximum data cylinder and back to the first data  
cylinder. The full-stroke typical value is determined by averaging 100  
full-stroke seeks in both directions.  
Seek type  
Typical read  
(msec)  
Typical write  
(msec)  
Track-to-track  
Average  
4
5
12  
26  
14  
28  
Full-stroke  
Average latency: 6.65 msec  
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Marathon 2250 and Marathon 1680 Product Manual  
1.6 Start times  
Power-on to Ready (sec)  
3.5 typical, 7 max  
2 typical, 3 max  
0.4 max  
Standby to Ready (sec)  
Idle to Ready (sec)  
1.7 Power specifications  
The drive receives DC power (+5V) through pin 41 and pin 42 of the AT  
interface connector.  
1.7.1 Power consumption  
Power requirements for the drive are listed in the table below. Typical power  
measurements are based on an average of drives tested under nominal  
conditions, using 5.0V input voltage at 40°C ambient temperature at sea  
level. Active mode current and power are measured with a 32-msec delay  
between each operation and the drive in default logical geometry. Seeking  
power and currents are measured during one-third-stroke buffered seeks.  
Read/write power and current are measured with the heads on track, based  
on a 16-sector write followed by a 32-msec delay, then a 16-sector read  
followed by a 32-msec delay. Spinup power is measured from time of  
power-on to time of drive-ready for normal operation. The average peak  
represents peak power that is drawn from the battery.  
Watts  
Amps  
Mode  
(at nominal voltage) (at nominal voltage)  
Max  
Max  
Typical  
Typical  
Spinup  
Peak (see Figure 1) —  
1.3  
Average  
4.0  
0.8  
Active  
Read/Write  
Seeking  
2.5  
2.5  
2.6  
2.6  
0.5  
0.5  
0.52  
0.52  
Idle  
1.2  
0.3  
0.1  
1.3  
0.24  
0.06  
0.02  
0.26  
0.072  
0.02  
Standby  
Sleep  
0.36  
0.1  
Marathon 2250 and Marathon 1680 Product Manual  
9
Current (mA)  
1,400  
Drive ready  
1,200  
1,000  
800  
600  
400  
200  
0
Upload code  
Idle  
mode  
Standby  
mode  
Active  
mode  
Sleep  
mode  
Spinup  
0
1
2
3
4
5
5
6
7
8
9
10  
11  
12  
Time (seconds)  
Figure 1. Typical startup and operation current profile  
1.7.1.1 Typical current profile  
Figure 1 shows a projected drive startup and operation current profile for  
the Marathon 2250 and the Marathon 1680.  
Note. The peaks in Figure 1 are the result of inductive kickback from  
the commutation of the spindle motor and, therefore, do not draw  
power from the battery.  
1.7.2 Power recovery  
Except during execution of a write command or writing cached data, the  
drive’s power can be interrupted without adversely affecting the drive or  
previously written data. If power is removed while the drive is performing a  
write operation, the integrity of the data being written cannot be guaranteed.  
Note. Do not remove power from the drive while the interface signals are ac-  
tive (at low impedance) because power may enter the input buffers.  
1.7.3 Conducted noise  
The drive is expected to operate with a maximum of:  
150 mV peak-to-peak triangular-wave injected noise at the power  
connector. The frequency is 10 Hz to 100 KHz with equivalent resistive  
loads.  
10  
Marathon 2250 and Marathon 1680 Product Manual  
100 mV peak-to-peak triangular-wave injected noise at the power  
connector. The frequency is 100 KHz to 10 MHz with equivalent  
resistive loads.  
Note. Equivalent resistance (9.26 ohms) is calculated by dividing the  
nominal voltage (5V) by the typical RMS read/write current (0.54  
amps).  
1.7.4 Voltage tolerance  
Voltage tolerance (including noise): +5 volts, ± 5%  
1.7.5 Power-management modes  
Seagate’s Marathon drives provide programmable power management  
to enhance battery life and to provide greater energy efficiency. In most  
computers, you can control power management through the system  
setup program. These drives feature several power-management  
modes, which are summarized in the following table and are described  
in more detail below:  
Mode  
Active  
Idle  
Heads  
Moving  
Varies  
Parked  
Parked  
Spindle  
Rotating  
Rotating  
Stopped  
Stopped  
Buffer  
Enabled  
Enabled  
Enabled  
Disabled  
Standby  
Sleep  
Active mode. The drive is in Active mode during the read/write and seek  
operations.  
Idle mode. At power-on, the drive sets the Idle Timer to enter Idle mode  
after 5 seconds of inactivity. The drive remains in Idle mode with heads  
flying over the media for 15 minutes; then the drive makes the transition  
to Active mode and seeks to the last-known logical block address, where  
it remains for 5 minutes. The drive then seeks to a new, unspecified  
location two more times, for 5 minutes each, after which it makes the  
transition to Standby mode. In Idle mode, the spindle remains up to  
speed, the buffer remains enabled, and the drive accepts all commands  
and returns to Active mode whenever a disc access command is re-  
ceived.  
The drive enters Idle mode when an Idle or Idle Immediate command is  
received. The Idle or Idle Immediate command overrides the algorithm  
described above. The drive remains in Idle mode until a disc access  
command is received or the standby timer expires, whichever occursfirst.  
Marathon 2250 and Marathon 1680 Product Manual  
11  
When the standby timer expires, the drive makes the transition to the  
Standby mode. The drive requires approximately 100–200 msec to return  
to Active mode from Idle mode.  
Standby mode. The drive enters Standby mode when the host sends a  
Standby or Standby Immediate command. If the standby command has set  
the standby timer, the drive enters Standby mode automatically after the  
drive has been inactive for the specified length of time. In Standby mode,  
the buffer remains enabled, the heads are parked and the spindle is at rest.  
The drive accepts all commands and returns to Active mode any time a disc  
access command is received. The drive requires approximately 3 seconds  
to return to Active mode from Standby mode.  
Sleep mode. The drive enters Sleep mode only after receiving a Sleep  
command from the host. The heads are parked and the spindle is at rest.  
The ROM and RAM codes are valid; however, the cache is flushed before  
going to sleep. The drive leaves Sleep mode when either a Hard Reset  
interface signal or a Soft Reset signal (Device Control register=04) is  
received from the host. After receiving a Soft Reset, the drive exits Sleep  
mode and enters Standby mode, with all current emulation and transla-  
tion parameters intact. After receiving a Hard Reset signal, the drive exits  
Sleep mode and enters Active mode. The drive is reinitialized to the  
default parameters. This is the same procedure as initial power-on and  
requires approximately 7 seconds to complete.  
Idle and standby timers. The drive sets the default time delay for the idle  
timer at power-on to 5 seconds. If the idle timer reaches zero before any  
drive activity is required, the drive makes a transition to Idle mode. Each  
time the drive performs an Active function (read, write or seek), the idle and  
standby timers are reinitialized and begin counting down from their specified  
delay times to zero. If the standby timer has been set and no additional drive  
activity occurs, the drive remains in Idle mode for the time specified in the  
standby timer, then enters Standby mode.  
If the host has not set the standby timer and no additional drive activity  
occurs, the drive remains in Idle mode for 30 minutes, then enters standby  
mode. In both Idle and Standby mode, the drive accepts all commands and  
returns to Active mode when disc access is necessary.  
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Marathon 2250 and Marathon 1680 Product Manual  
1.8 Environmental tolerances  
1.8.1 Ambient temperature  
Operating  
5° to 55°C (41° to 131°F)  
Nonoperating  
–40° to 70°C (–40° to 158°F)  
Caution. This drive needs sufficient airflow so that the maximum surface  
temperature at the center of the top cover of the drive does not  
exceed 62 degrees C (144 degrees F).  
1.8.2 Temperature gradient  
Operating  
30°C/hr (86°F/hr) max, without condensation  
Nonoperating  
30°C/hr (86°F/hr) max, without condensation  
1.8.3 Humidity  
1.8.3.1 Relative humidity  
Operating  
Storage  
Transit  
8% to 80% noncondensing (10% per hour max)  
8% to 90% noncondensing (10% per hour max)  
5% to 95% noncondensing (10% per hour max)  
1.8.3.2 Wet bulb temperature  
Operating  
29.4°C (85°F) max  
40°C (104°F) max  
Nonoperating  
1.8.4 Altitude  
Operating  
–300 m to 3,040 m (–1,000 ft to 10,000 ft)  
–300 m to 12,190 m (–1,000 ft to 40,000 ft)  
Nonoperating  
1.8.5 Shock  
For shock specifications, it is assumed that the drive is mounted securely  
with the input levels at the drive mounting screws. For nonoperating  
specifications, it is assumed that the read/write heads are positioned in  
the shipping zone.  
Marathon 2250 and Marathon 1680 Product Manual  
13  
Note. At power-down, the read/write heads automatically move to the  
shipping zone. The head and slider assembly park inside of the  
maximum data cylinder. When power is applied, the heads re-  
calibrate to Track 0.  
1.8.5.1 Operating shock  
The Marathon 2250 and the Marathon 1680 incorporate SafeRite shock  
protection and can withstand a maximum operating shock of 125 Gs  
without nonrecoverable data errors (based on half-sine shock pulses of  
2 msec).  
1.8.5.2 Nonoperating shock  
The nonoperating shock level that the Marathon 2250 and Marathon  
1680 can tolerate without incurring physical damage or degradation in  
performance is 350 Gs (based on half-sine shock pulses of 2 msec  
duration) or 150 Gs (based on half-sine shock pulses of 11 msec  
duration). Shock pulses are defined by MIL-STD-202 F with the ampli-  
tude tolerance controlled to ± 5%.  
1.8.6 Vibration  
For vibration specifications, it is assumed that the drive is mounted in an  
approved orientation with the input levels at the drive mounting screws.  
For the nonoperating specifications, it is assumed that the read/write  
heads are positioned in the shipping zone.  
1.8.6.1 Operating vibration  
The following table lists the maximum vibration levels that the drive may  
experience without incurring physical damage, data loss or performance  
degradation.  
5–22 Hz  
0.02-inch displacement (peak-to-peak)  
0.75 Gs acceleration (0 to peak)  
0.75 Gs acceleration (0 to peak)  
0.02-inch displacement (peak-to-peak)  
22–400 Hz  
400–22 Hz  
22–5 Hz  
14  
Marathon 2250 and Marathon 1680 Product Manual  
1.8.6.2 Nonoperating vibration  
The following table lists the maximum nonoperating vibration that the  
drive may experience without incurring physical damage or degradation  
in performance.  
5–22 Hz  
0.2-inch displacement (peak-to-peak)  
4 Gs acceleration (0 to peak)  
22–400 Hz  
400–22 Hz  
22–5 Hz  
4 Gs acceleration (0 to peak)  
0.2-inch displacement (peak-to-peak)  
1.9 Drive acoustics  
Drive acoustics are measured as sound power, using techniques that are  
generally consistent with ISO document 7779. Measurements are taken  
under essentially free-field conditions over a reflecting plane, using a total  
of nine microphones that measure in the 250–4,000 Hz band. This method-  
ology determines broad-band and narrow-band noise, and discrete fre-  
quency components. For all tests, the drive is oriented with the cover facing  
upward.  
Mode  
Typical  
3.5  
Maximum  
Idle (sound power-bels)  
Seek (sound power-bels)  
Idle (sound pressure-dBA)  
Seek (sound pressure-dBA)  
3.8  
4.1  
28  
3.8  
24  
26  
30  
1.10 Reliability  
Nonrecoverable read errors  
1 per 1013 bits read  
Mean time between failures  
(MTBF)  
300,000 power-on hours  
(nominal power, at sea level and  
40°C ambient temperature)  
Contact start-stop cycles  
(CSS)  
50,000 cycles  
(at nominal voltage and 40°C, with 60  
cycles per hour and a 50% duty cycle)  
Preventive maintenance  
Service life  
None required  
5 years  
Marathon 2250 and Marathon 1680 Product Manual  
15  
1.11 Agency certification  
1.11.1 Safety certification  
The drive is recognized in accordance with UL 1950 and CSA C22.2  
(950-M89) and meets all applicable sections of IEC 380, IEC 435,  
IEC 950, VDE 0806/08.81 and EN 60950 as tested by TUV-Rheinland,  
North America.  
1.11.2 Electromagnetic Compatibility  
Hard drives that display the CE marking comply with European Union  
requirements specified in Electromagnetic Compatibility Directive  
89/336/EEC 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 with the  
EC directives specified in the previous paragraph. Drives are tested in  
representative end-user systems using 80486, Pentium and PowerPC  
microprocessors. Although CE-marked Seagate drives comply with the  
directives when used in the test systems, we cannot guarantee that all  
systems will comply with the directives. The drive is designed for opera-  
tion inside a properly designed enclosure, with properly shielded I/O  
cable (if necessary) and terminators on all unused I/O ports. The com-  
puter manufacturer or system integrator should confirm EMC compliance  
and provide CE marking for their products.  
1.11.3 FCC verification  
These drives are intended to be contained solely within a personal  
computer or similar enclosure, not attached as an external device. As  
such, each drive is considered to be a subassembly even when it is sold  
individually to the customer. As a subassembly, no Federal Communi-  
cations Commission verification or certification of the device is required.  
Seagate Technology, Inc. has tested this device in enclosures as de-  
scribed above to ensure that the total assembly (enclosure, disc drive,  
motherboard, power supply, etc.) complies with the limits for a Class B  
computing device, pursuant to Subpart J, Part 15 of the FCC rules.  
Operation with noncertified assemblies is likely to result in interference  
with 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  
with radio and television reception.  
16  
Marathon 2250 and Marathon 1680 Product Manual  
This equipment is designed to provide reasonable protection against  
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 with radio or television reception  
(which can be determined by turning the equipment on and off), 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 computer into a different outlet so that the receiver and  
computer are on different branch outlets.  
If necessary, you should consult your dealer or an experienced radio or  
television technician for additional suggestions. You may find the follow-  
ing booklet from the Federal Communications Commission helpful: How  
to Identify and Resolve Radio-Television Interference Problems. This  
booklet is available from the Superintendent of Documents, U.S. Gov-  
ernment Printing Office, Washington, DC 20402. Refer to publication  
number 004-000-00345-4.  
Marathon 2250 and Marathon 1680 Product Manual  
17  
2.0 Drive mounting and configuration  
2.1 Handling and static-discharge precautions  
After unpacking, but before installation, the drive may be exposed to  
potential handling and ESD hazards. You must observe standard static-  
discharge precautions. A grounded wrist-strap is recommended.  
Handle the drive only by the sides of the head/disc assembly. Avoid  
contact with the printed circuit board, all electronic components and the  
interface connector. Do not apply pressure to the top cover. Always rest  
the drive on a padded antistatic surface until you mount it in the host  
system.  
2.2 Jumper settings  
2.2.1 Master/slave configuration  
You must establish a master/slave relationship between two drives that are  
attached to a single AT bus. You can configure a drive to become a master  
or slave by setting the master/slave jumpers, as described below and shown  
in Figure 2 on page 18.  
Alternatively, you can configure the drive as a master or slave using the  
cable-select option. This requires a special daisy-chain cable that  
grounds pin 28 (CSEL) on one of its two drive connectors. If you attach  
the drive to the grounded CSEL connector, it becomes a master. If you  
attach the drive to the ungrounded CSEL connector, it becomes a slave.  
To use this option, the host system and both drives must support cable-  
select and both drives must be configured for cable-select. To configure  
Marathon drives for cable-select, install both master/slave jumpers.  
For the host to recognize the slave drive using the DASP– signal, the  
slave drive must assert the DASP– signal at power-up, and the master  
drive must monitor DASP– at power-up.  
18  
Marathon 2250 and Marathon 1680 Product Manual  
Note. Drive is shown with  
circuit board up.  
Master/slave  
configuration jumpers  
Pin 1  
Pin 20 removed for keying  
Circuit board  
B
A
D
C
Drive is master; slave may be detected using DASP– signal  
Drive is master; Seagate slave drive present  
Drive is slave; Seagate master drive present  
Use CSEL pin grounding to differentiate master from slave  
Figure 2. Connector and master/slave jumper setup  
Jumper  
for pins  
Jumper  
for pins  
A and B C and D  
Configuration  
Off  
Off  
On  
On  
Off  
On  
Off  
On  
Drive is master; slave drive may be detected  
using DASP– signal. CSEL is ignored.  
Drive is master; slave drive is present. CSEL  
is ignored. DASP– is ignored.  
Drive is slave (a master drive should be  
present also). CSEL is ignored.  
Differentiate master and slave drives using  
cable-select: If a drive is attached to a  
connector in which pin 28 is grounded, then it  
becomes a master. If a drive is attached to a  
connector in which pin 28 is ungrounded,  
then it becomes a slave.  
Marathon 2250 and Marathon 1680 Product Manual  
19  
2.3 Remote LED configuration  
The drive indicates activity to the host through the DASP– line (pin 39)  
on the ATA interface. This line may be connected to a drive status  
indicator driving an LED at 5V. The line has a 30 mA nominal current  
limit; however, most external LEDs are sufficiently bright at 15 mA.  
Because the LED drops 1.7 volts, we recommend that you place a  
200-ohm resistor in series with the LED to limit the current to 15 mA.  
2.4 Drive mounting  
You can mount the drive in any orientation using four screws in the four  
side-mounting or four bottom-mounting holes. Allow a minimum clear-  
ance of 0.030 inches (0.76 mm) for cooling around the entire perimeter  
of the drive. The drive conforms to the industry-standard SFF-8200  
mounting specifications and requires the use of SFF-8200-compatible  
connectors in direct-mounting applications. See Figures 3 and 4 on  
pages 20 and 21 for drive mounting dimensions.  
Note. Per SFF 8004 specifications, the I/O connector pins may extend  
up to 0.015 inches beyond the edge of the head/disc assembly.  
Caution. This drive needs sufficient airflow so thatthe maximumsurface  
temperature at the center of the top cover of the drive does  
not exceed 62°C (144°F).  
Caution. To avoid damaging the drive, use M3X0.5 metric mounting  
screws only. Do not insert mounting screws more than  
0.150 inches (3.81 mm) into the mounting holes. Do not over-  
tighten the screws (maximum torque: 3 inch-lb).  
20  
Marathon 2250 and Marathon 1680 Product Manual  
A40  
A39  
S1  
(to tips of I/O connector pins)  
A6  
(to end of HDA)  
A1 +A2 –A3  
A25  
A24  
A23  
Z
A37  
X2  
A37  
X1  
A21 ± A22  
A26 thread, 4PLC  
min A38 full thread  
center within A27 of  
position specified  
A31  
A30  
A7  
A28  
X
A37  
Z1  
A37  
Z2  
A4 ± A5  
(width at  
mounting  
holes)  
A29  
A32 thread, 4PLC  
min A41 full thread  
center within A33 of  
position specified  
A37  
Z3  
A37  
Z4  
x
z
y
A8  
Figure 3. Drive mounting dimensions—side and bottom view  
(for dimension specifications, see table on pages 21 and 22).  
Marathon 2250 and Marathon 1680 Product Manual  
21  
Pin 20 removed  
for keying  
Pin 1  
A34  
Pin 44  
Z
A35  
A1  
+A2 –A3  
A36  
A19 M  
A20  
z x  
A13  
± A14  
A12  
M
Detail  
A9  
A11  
A15 M  
A16  
z x  
A17  
± A18  
M
Z
A10  
A10.1  
±
Figure 4. Drive mounting dimensions—end view  
(for dimension specifications, see table below).  
Mounting dimension specifications  
Dim. Description  
inches mm  
A1  
A2  
A3  
A4  
A5  
A6  
A7  
A8  
A9  
A10  
Drive height  
0.668  
0.008  
0.008  
2.750  
0.009  
3.955  
0.403  
16.97  
0.20  
+ tolerance on drive height  
– tolerance on drive height  
0.20  
Drive width at mounting holes  
+ and – tolerance on drive width at mounting holes  
Maximum drive length (not including I/O pins)  
Front-to-back connector location  
69.85  
0.23  
100.45  
10.2  
1.00  
3.99  
10.14  
0.38  
2.00  
2.00  
0.50  
0.05  
0.75  
Allowable range, front-to-back connector location 0.039  
Top-to-bottom connector location, pin center line 0.157  
Side-to-side connector location, pin center line  
0.399  
A10.1 + and – tolerance, side-to-side connector location 0.015  
A11  
A12  
A13  
A14  
A15  
Top-to-bottom pin spacing  
0.079  
0.079  
0.020  
0.002  
Side-to-side pin spacing  
Pin side-to-side dimension  
+ and – tolerance on pin side-to-side dimension  
Allowable range, side-to-side connector location 0.030  
continued on following page  
22  
continued from previous page  
Mounting dimension specifications  
Marathon 2250 and Marathon 1680 Product Manual  
Dim. Description  
inches mm  
A16  
A17  
A18  
A19  
A20  
A21  
A22  
A23  
A24  
A25  
Allowable range, side-to-side, pins within connector 0.003  
Pin top-to-bottom dimension 0.020  
0.08  
0.50  
0.05  
0.50  
0.08  
3.86  
0.20  
3.00  
14.0  
76.6  
+ and – tolerance on pin top-to-bottom dimension 0.002  
Allowable range, top-to-bottom connector location 0.020  
Allowable range, top-to-bottom, pins in connector 0.003  
Connector pin length  
0.152  
0.008  
0.118  
0.551  
3.016  
+ and – tolerance on pin length  
Side mounting hole height  
Front-to-back location of side mounting holes  
Front-to-back distance between side mounting  
holes  
A26  
A27  
A28  
Thread description, side mounting holes  
n/a  
M3  
Diam. of cylinder into which hole center must fall 0.020  
0.50  
4.06  
Distance between side of drive and center of  
nearest bottom mounting holes (on pin-44 side)  
0.160  
A29  
Side-to-side distance between bottom mounting 2.430  
holes  
61.72  
A30  
A31  
Front-to-back location of bottom mounting holes 0.551  
14.0  
76.6  
Front-to-back distance between bottom mounting 3.016  
holes  
A32  
A33  
A34  
A35  
Thread description, bottom mounting holes  
n/a  
M3  
Diam. of cylinder into which hole center must fall 0.020  
0.50  
1.00  
8.00  
Min. vertical clearance for mating connector  
0.039  
0.315  
Max. side-to-side distance from pin-44 edge of  
HDA near I/O connector to start of clearance for  
mating connector  
A36  
Min. side-to-side clearance from pin-44 edge of  
I/O connector to any object interrupting  
clearance of mating connector  
2.370  
60.20  
A37  
A38  
A39  
A40  
A41  
S1  
Diam. of datum targets and reference areas  
Min. thread depth, side mounting holes  
Min. pin centerline to chamfer above connector  
Min. chamfer above connector  
0.315  
0.118  
0.049  
0.010  
0.098  
3.970  
8.00  
3.00  
1.25  
0.25  
2.50  
100.84  
Min. thread depth, bottom mounting holes  
Maximum drive length to tips of I/O pins  
(Non-SFF dimension—for reference only)  
Marathon 2250 and Marathon 1680 Product Manual  
23  
2.5 ATA interface connector  
The drive connector is a 44-conductor connector with 2 rows of 22 male  
pins on 0.079-inch (2 mm) centers (see Figure 4 on page 21 and Figure  
5). The mating cable connector is a 44-conductor, nonshielded connector  
with 2 rows of 22 female contacts on 0.079-inch (2 mm) centers. The  
connectors should provide strain relief and should be keyed with a plug  
in place of pin 20.  
These drives are designed to support the industry-standard SFF-8200  
mounting specifications. When installing these drives in fixed mounting  
applications, use only SFF-compatible connectors such as Molex part  
number 87368-442x. For applications that involve flexible cables or  
printed circuit cables (PCCs), use Molex part number 87259-4413 or  
equivalent to connect the drive to the system. Select a connector that  
provides adequate clearance for the master/slave configuration jumpers  
if the application requires the use of such jumpers. The ATA interface  
cable should be no more than 18 inches long.  
Note. Per SFF 8004 specifications, the I/O connector pins may extend  
up to 0.015 inches beyond the edge of the head/disc assembly.  
Master/slave jumpers  
1.654 (42.01)  
0.158 ± 0.003 (4.00 ± 0.08)  
Dimensions are in inches (mm)  
Figure 5. ATA Interface connector dimensions (non-SFF dimension, for  
reference only)  
24  
Marathon 2250 and Marathon 1680 Product Manual  
Marathon 2250 and Marathon 1680 Product Manual  
25  
3.0 ATA Attachment-3 Interface (ATA-3)  
The drives in this manual comply with the ATA-3 Standard, proposed by  
the X3T10 committee, a Technical Committee of Accredited Standards  
Committee X3, of the American National Standards Institute (ANSI).  
The X3T10 committee has been renamed to X3T13 to reflect its current  
standards work. For more information about the committee and the  
standards, see the committee’s Internet FTP site:  
ftp://fission.dt.wdc.com/pub/standards/X3T13T  
3.1 ATA interface signals and connector pins  
Figure 6 on page 26 summarizes the signals on the ATA interface  
connector that the drive supports. For a detailed description of these  
signals, refer to the Working Draft of the Proposed American National  
Standard X3T10/2008D Revision 6, Information Technology AT Attach-  
ment-3Interface(ATA-3),subsequently referred to as theDraft Proposed  
ATA-3 Standard.  
3.1.1 AT bus signal levels  
Signals that the drive sends have the following output characteristics at  
the drive connector:  
Logic Low  
Logic High  
0.0V to 0.4V  
2.5V to 5.25V  
Signals that the drive receives must have the following input charac-  
teristics, measured at the drive connector:  
Logic Low  
Logic High  
0.0V to 0.8V  
2.0V to 5.25V  
26  
Marathon 2250 and Marathon 1680 Product Manual  
Drive pin #  
Host pin # and signal description  
Signal name  
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  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
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  
Ground  
IORDY  
CSEL  
26 Ground  
27 I/O Channel Ready  
28 Cable Select pin  
29 DMA Acknowledge  
30 Ground  
DMACK  
Ground  
INTRQ  
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 / Slave Present  
40 Ground  
41 +5 volts DC (logic)  
42 +5 volts DC (motor)  
43 Ground for power pins  
44 Reserved  
IOCS16  
DA1  
PDIAG  
DA0  
DA2  
CS1FX  
CS3FX  
DASP  
Ground  
Power  
Power  
Ground  
Reserved  
Pins 28, 34 and 39 are used for master-slave communication (details shown below).  
Drive 1 (slave)  
Drive 0 (master)  
Host  
28  
34  
39  
28  
34  
39  
CSEL  
28  
34  
39  
PDIAG  
DASP–  
Figure 6. I/O pins and supported ATA signals  
Marathon 2250 and Marathon 1680 Product Manual  
27  
3.2 ATA Interface commands  
3.2.1 Supported ATA commands  
The following table lists supported ATA-standard and Seagate-specific  
drive commands. For a detailed description of the ATA commands, refer  
to the Draft Proposed ATA-3 Standard. See Section 3.2.4 on page 33 for  
details and subcommands used in the S.M.A.R.T. implementation.  
Supported by  
Command  
Marathon 2250  
and Marathon 1680  
Command name  
code  
ATA-standard commands  
Execute Drive Diagnostics  
90H  
50H  
ECH  
91H  
00H  
E4H  
C8H  
C9H  
22H  
23H  
C4H  
20H  
21H  
40H  
41H  
10H  
70H  
EFH  
C6H  
Yes  
Yes  
Yes  
Yes  
No  
Format Track  
Identify Drive  
Initialize Drive Parameters  
NOP  
Read Buffer  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Read DMA (w/retry)  
Read DMA (no retry)  
Read Long (w/retry)  
Read Long (no retry)  
Read Multiple  
Read Sectors (w/retry)  
Read Sectors (no retry)  
Read Verify Sectors (w/retry)  
Read Verify Sectors (no retry)  
Recalibrate  
Seek  
Set Features  
Set Multiple Mode  
continued on following page  
28  
Marathon 2250 and Marathon 1680 Product Manual  
continued from previous page  
Supported by  
Marathon 2250  
and Marathon 1680  
Command  
code  
Command name  
Execute S.M.A.R.T Command  
Write Buffer  
B0H  
E8H  
CAH  
CBH  
32H  
33H  
C5H  
E9H  
30H  
31H  
3CH  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
No  
Write DMA (w/retry)  
Write DMA (no retry)  
Write Long (w/retry)  
Write Long (no retry)  
Write Multiple  
Write Same  
Write Sectors (w/retry)  
Write Sectors (no retry)  
Write Verify  
Yes  
Yes  
No  
Drive Security Commands  
Security Set Password  
F1H  
F2H  
F3H  
F4H  
F5H  
F6H  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Security Unlock  
Security Erase Prepare  
Security Erase Unit  
Security Freeze Lock  
Security Disable Password  
ATA-standard power-management commands  
Check Power Mode  
Idle  
98H or E5H  
97H or E3H  
95H or E1H  
99H or E6H  
96H or E2H  
94H or E0H  
Yes  
Yes  
Yes  
Yes  
Yes  
Yes  
Idle Immediate  
Sleep  
Standby  
Standby Immediate  
Marathon 2250 and Marathon 1680 Product Manual  
29  
The following commands contain drive-specific features that may not be  
described in the Draft Proposed ATA-3 Standard.  
3.2.2 Identify Drive command  
The Identify Drive command (command code ECH) transfers information  
about the drive to the host following power-up. The data is organized as  
a single 512-byte block of data, the contents of which are shown in the  
table below. All reserved bits or words should be set to zero. Parameters  
listed with an “x” are drive-specific or vary with the state of the drive. See  
Section 1 of this manual for default parameter settings for the Marathon  
2250 and the Marathon 1680.  
Word  
Description  
Configuration information:  
Contents  
0
0040H  
Bit 6: fixed drive  
1108H  
(ST92255AG)  
0CB8H  
Number of fixed cylinders (default logical  
emulation): 4,360 (ST92255AG);  
3,256 (ST91685AG)  
1
(ST91685AG)  
2
3
ATA-reserved  
0000H  
Number of heads (default logical emulation):  
16  
0010H  
4
5
ATA-obsolete  
ATA-obsolete  
0000H  
0000H  
Number of sectors per track  
(default logical emulation): 63  
6
003FH  
0000H  
ASCII  
7–9 Not used by this drive  
Serial number:  
10–19  
(20 ASCII characters, 0000H = none)  
20  
21  
22  
ATA-obsolete  
0000H  
0000H  
0010H  
ATA-obsolete  
Number of ECC bytes available (16)  
Firmware revision (8 ASCII character string):  
23–26 xx = ROM version, ss = RAM version,  
tt= RAM version  
xx.ss.tt  
continued on following page  
30  
Marathon 2250 and Marathon 1680 Product Manual  
continued from previous page  
Word  
Description  
Contents  
ST92255AG or  
ST91685AG  
Drive model number: (40 ASCII characters,  
padded with blanks to end of string)  
27–46  
Maximum sectors per interrupt on read/write  
multiple  
47  
48  
0010H  
0000H  
Double word I/O (not supported)  
Standby timer values supported per ATA  
standard, IORDY supported, IORDY can  
be disabled  
49  
2C00H  
50  
51  
52  
ATA-reserved  
0000H  
0200H  
0000H  
PIO data-transfer cycle timing mode  
DMA transfer cycle timing mode (not used)  
Validity of words 54–58 and words 64–70  
(words may be valid)  
53  
54  
55  
56  
0003H  
xxxxH  
xxxxH  
Number of cylinders  
(current emulation mode)  
Number of heads  
(current emulation mode)  
Number of sectors per track  
(current emulation mode)  
xxxxH  
xxxxH  
01xxH  
57–58 Number of sectors (current emulation mode)  
Number of sectors transferred during a Read  
Multiple or Write Multiple command  
59  
(ST92255AG)  
0FBC 0043H  
60–61 LBA sectors available  
(ST91685AG)  
017FC 0032H  
62  
63  
ATA obsolete  
0000H  
0x07H  
Multiword DMA active/modes supported  
(see note following)  
Advanced PIO modes supported (modes 3  
and 4 supported)  
64  
0003H  
Marathon 2250 and Marathon 1680 Product Manual  
31  
Word  
Description  
Contents  
Minimum multiword DMA transfer cycle time  
per word (120 nsec)  
65  
0078H  
0078H  
016BH  
0078H  
Recommended multiword DMA transfer  
cycle time per word (180 nsec)  
66  
67  
68  
Minimum PIO cycle time without IORDY flow  
control (363 nsec)  
Minimum PIO cycle time with IORDY flow  
control (120 nsec)  
69–127 ATA-reserved  
128–159 Seagate-reserved  
160–255 ATA-reserved  
0000H  
xxxxH  
0000H  
Note. The following DMA mode settings are used in word 63 of the  
Identify Drive command:  
Word  
63  
Bit Description (if bit is set to 1)  
0
Multiword DMA mode 0 available  
Multiword DMA mode 1 available  
Multiword DMA mode 2 available  
Multiword DMA mode 0 currently active  
Multiword DMA mode 1 currently active  
Multiword DMA mode 2 currently active  
63  
1
63  
2
63  
8
63  
9
63  
10  
32  
Marathon 2250 and Marathon 1680 Product Manual  
3.2.3 Set Features command  
This command controls the implementation of various features that the  
drive supports. When the drive receives this command, it sets BSY,  
checks the contents of the Features register, clears BSY and generates  
an interrupt. If the value in the register does not represent a feature that  
the drive supports, the command is aborted. Power-on default has the  
read look-ahead and write caching features enabled and 4 bytes of ECC.  
The acceptable values for the Features register are defined as follows:  
01H  
02H  
03H  
Obsolete  
Enable write cache (default)  
Set transfer mode (based on value in Sector Count register)  
Sector Count register values:  
00H Set PIO mode to default (PIO mode 2), enable IORDY  
01H Set PIO mode to default (PIO mode 2), disable IORDY  
08H PIO Mode 0  
09H PIO Mode 1  
0AH PIO Mode 2 (default)  
0BH PIO Mode 3  
0CH PIO Mode 4  
10H Obsolete  
11H Obsolete  
12H Obsolete  
20H Multiword DMA Mode 0  
21H Multiword DMA Mode 1  
22H Multiword DMA Mode 2  
Enable auto-read reassignment (default)  
Not implemented  
04H  
33H  
44H  
Sixteen bytes of ECC apply on read long and write long  
commands  
54H  
55H  
66H  
77H  
81H  
82H  
84H  
88H  
Not implemented  
Disable read look-ahead (read cache) feature  
Disable reverting to power-on defaults  
Not implemented  
Obsolete  
Disable write cache  
Not implemented  
Not implemented  
Marathon 2250 and Marathon 1680 Product Manual  
33  
99H  
Not implemented  
9AH  
AAH  
ABH  
BBH  
Not implemented  
Enable read look-ahead (read cache) feature (default)  
Not implemented  
4 bytes of ECC apply on read long and write long commands  
(default)  
CCH  
Enable reverting to power-on defaults (default)  
At power-on or after a hardware reset, the default values of the features  
are as indicated above. A software reset also changes the features to  
default values unless a 66H command has been received.  
34  
Marathon 2250 and Marathon 1680 Product Manual  
3.2.4 S.M.A.R.T. commands  
Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.) is an  
emerging technology that provides near-term failure prediction for disc  
drives. When S.M.A.R.T. is enabled, the Seagate drive monitors prede-  
termined drive attributes that are susceptible to degradation over time. If  
self-monitoring determines that a failure is likely, S.M.A.R.T. makes a  
status report available so that the host can prompt the user to back up  
data on the drive. Notall failures are predictable. S.M.A.R.T. predictability  
is limited to only those attributes the drive can monitor. For more  
information on S.M.A.R.T. commands and implementation, see the  
Working Draft of the Proposed American National Standard X3T10/2008D  
Revision 6, Information Technology AT Attachment-3 Interface (ATA-3).  
This drive is shipped with S.M.A.R.T. features disabled. You must have  
a recent BIOS or software package that supports S.M.A.R.T. to enable  
the feature. The table below shows the S.M.A.R.T. command codes that  
these drives use.  
Before executing a S.M.A.R.T. command by writing B0H to the Command  
Register, the host must do the following:  
Write the value 4FH to the Cylinder_Low register.  
Write the value C2H to the Cylinder_High register.  
Write the appropriate S.M.A.R.T. code to the Features register, as  
shown in the table below:  
Code in  
Features  
Register  
Supported by  
Marathon 2250 and  
Marathon 1680  
S.M.A.R.T. Command  
D8H  
D9H  
DAH  
Enable S.M.A.R.T. Operations Yes  
Disable S.M.A.R.T. Operations Yes  
Return S.M.A.R.T. Status  
Yes  
Note. If an appropriate code is not written to the Features Register, the  
command will be aborted and 0x04 (abort) will be written to the  
Error register.  
Marathon 2250 and Marathon 1680 Product Manual  
35  
3.2.5 Drive-Security commands  
The drive-security commands provide a password-based security sys-  
tem to prevent unauthorized access to a disc drive.  
During manufacturing, the master password, SEAGATE, is set for the  
drive, and the lock function is disabled. The system manufacturer or  
dealer may set a new master password using the Security Set Password  
command (F1H), without enabling the lock function. Before a user  
password is entered, the drive rejects all security commands except  
Security Set Password.  
When the user sets a password, the drive automatically enters lock mode  
(lock mode is enabled) the next time it is powered on. When lock mode is  
enabled, the drive rejects all media-access commands until the user enters  
the correct user password, completing a Security Unlock command.  
The drive supports two levels of security: high security and maximum  
security. In high-security mode, if you forget your password, you can still  
access the data by entering the master password. In maximum-security  
mode, if you forget your password, you cannot access the data. However,  
in maximum-security mode, you can erase all data on the drive and  
reinitialize the drive using the Erase Unit command (F4H). You must enter  
the master password to complete an Erase Unit command.  
The Freeze Lock command (F5H) prevents you from changing security  
features. If, during normal drive operation, the Freeze Lock command is  
executed, all normal drive commands are implemented, but the security  
commands Disable Password, Erase Unit, Set Password and Unlock  
cannot be completed.  
See the ATA-3 specification (Document X3T10/2008D) for additional  
details about the Drive Security Commands.  
36  
Marathon 2250 and Marathon 1680 Product Manual  
Marathon 2250 and Marathon 1680 Product Manual  
37  
Appendix. Compatibility notes  
ECC testing  
When a Marathon 2250 or Marathon 1680 performs hardware-based  
ECC error correction on-the-fly, the drive does not report an ECC error.  
This allows ECC correction without degrading drive performance. Some  
older drive diagnostic programs test ECC features by creating small data  
errors and then checking to see if they are reported. Such tests, when  
run on these drives, may incorrectly report an ECC detection failure  
because the drive hardware corrects the data automatically, avoiding the  
error rather than reporting it. Such a report does not indicate a drive  
malfunction.  
Seagate Technology, Inc.  
920 Disc Drive, Scotts Valley, California 95066, USA  
Publication Number: 36337-101, Rev. B, Printed in USA  

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