seagate ST3291A, ST3391A, ST3491A, ST3250A Product Manual

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ST3491 Family:

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ST3250A, ST3291A

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ST3391A, ST3491A

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AT Interface Drives

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Product Manual

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ST3491 Family:

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ST3250A, ST3291A

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ST3391A, ST3491A

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AT Interface Drives

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Product Manual

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© 1994 Seagate Technology, Inc. All rights reserved Publication Number: 36254-004, Rev. B

April 1994

Seagate®, Seagate Technology® and the Seagate logo are registered trademarks of Seagate Technology, Inc. SeaCacheä is a trademark 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.

ST3491 Family AT Product Manual, Rev. B iii

	Contents
1.0 Specification summary	. . . . . . . . . . . . . . . . . . . . . . 1
1.1 Formatted capacity	. . . . . . . . . . . . . . . . . . . . . . 1

1.1.1Physical organization . . . . . . . . . . . . . . . . . . . 1

1.1.2Recommended logical configuration . . . . . . . . . . . 2

1.2	Drive dimensions . . . . . .	. . . . . . . . . . . . . . . . . 2
1.2.1 Functional specifications		. . . . . . . . . . . . . . . . . 3
1.3	Reliability . . . . . . . . . .	. . . . . . . . . . . . . . . . . 3
1.4	Acoustics . . . . . . . . . .	. . . . . . . . . . . . . . . . . 3
1.5	Seek time . . . . . . . . . .	. . . . . . . . . . . . . . . . . 4
1.6	Auto-park . . . . . . . . . .	. . . . . . . . . . . . . . . . . 4
1.7	Shock and vibration . . . . .	. . . . . . . . . . . . . . . . . 4

1.8Environment . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.8.1Ambient temperature . . . . . . . . . . . . . . . . . . . 5

1.8.2Temperature gradient . . . . . . . . . . . . . . . . . . . 5

1.8.3Relative humidity . . . . . . . . . . . . . . . . . . . . . 5

1.8.4Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.9Power requirements . . . . . . . . . . . . . . . . . . . . . . 6

1.9.1		Input noise . . . . . . . . . . . . . .	. . . . . . . . . . 6
1.9.2		Start and stop time . . . . . . . . . .	. . . . . . . . . . 6
1.9.3		Idle and Standby timers . . . . . . .	. . . . . . . . . . 7
1.9.4		Power-management modes . . . . .	. . . . . . . . . . 7
1.9.5		Power consumption . . . . . . . . .	. . . . . . . . . . 9
1.10 Agency listings . . . . . . . . . . . . . .			. . . . . . . . . . 9
1.11 FCC verification . . . . . . . . . . . . .			. . . . . . . . .	10
2.0 Hardware description . . . . . . . . . . . . .			. . . . . . . . .	11
2.1	Handling and static-discharge precautions		. . . . . . . . .	11
2.2	Drive mounting . . . . . . . . . . . . . .		. . . . . . . . .	12
2.3	Drive I/O connector . . . . . . . . . . . .		. . . . . . . . .	15
3.0 Interface description . . . . . . . . . . . . .			. . . . . . . . .	17

iv	ST3491 Family AT Product Manual, Rev. B
3.1	AT interface connector pin assignments . . . . . . . . . . 17

3.2Bus signal levels . . . . . . . . . . . . . . . . . . . . . . . 17

3.3Configuration jumpers . . . . . . . . . . . . . . . . . . . . 19

3.3.1Factory test configuration . . . . . . . . . . . . . . . . 20

3.3.2 Master/slave configuration . . . . . . . . . . . . . . . 20

3.3.3No DASP– configuration . . . . . . . . . . . . . . . . 20

3.4Cable select configuration . . . . . . . . . . . . . . . . . . 21

3.5 Drive activity LED . . . . . . . . . . . . . . . . . . . . . . 22

3.6Supported AT commands . . . . . . . . . . . . . . . . . . 23

3.6.1Identify Drive command (ECH) . . . . . . . . . . . . . 25

3.6.2	Set Features command (EFH) . . .	. . . . . . . . . .	28
3.6.3	Set Multiple Mode command (C6H)	. . . . . . . . . .	30

3.6.4Read Multiple command (C4H) . . . . . . . . . . . . . 30

3.6.5Write Multiple command (C5H) . . . . . . . . . . . . . 31

3.7Onboard drive diagnostics . . . . . . . . . . . . . . . . . . 32

3.8ECC performance tests . . . . . . . . . . . . . . . . . . . 32

3.9Supported BIOS . . . . . . . . . . . . . . . . . . . . . . . 33

ST3491 Family AT Product Manual, Rev. B v

Figures

Figure 1. Typical startup current profile . . . . . . . . . . . . . . . . 8

Figure 2. Standard mounting dimensions . . . . . . . . . . . . . .		13
Figure 3. Metric mounting dimensions . . . . . . . . . . . . . . . .		14
Figure 4.	AT interface drive connector . . . . . . . . . . . . . . . .	15
Figure 5.	AT connector pin assignments . . . . . . . . . . . . . .	18
Figure 6.	Connectors and jumpers . . . . . . . . . . . . . . . . .	19
Figure 7.	Connecting cable-selected drives . . . . . . . . . . . . .	21

ST3491 Family AT Product Manual, Rev. B

1

1.0Specification summary

1.1Formatted capacity

The drive is low-level formatted at the factory. You cannot low-level format the drive.

	ST3250A	ST3291A
Formatted capacity (Mbytes*)	213.9	272.7
Total sectors	417,792	532,700
	ST3391A	ST3491A
Formatted capacity (Mbytes*)	341.3	428.1
Total sectors	666,624	836,070

* One megabyte equals one million bytes.

1.1.1Physical organization

	ST3250A	ST3291A
Heads	2	4
Discs	1	2
	ST3391A	ST3491A
Heads	4	4
Discs	2	2

2	ST3491 Family AT Product Manual, Rev. B

1.1.2Recommended logical configuration

You can operate the drive using many different logical configurations, provided the number of sectors per track does not exceed 256. However, in DOS the number of sectors per track must be less than or equal to 63. When establishing the logical configuration, set the number of sectors per track and the number of heads to satisfy the following relationship:

16 ≤ (sectors per track) x (heads) ≤ 4,096

When you configure the drive in CMOS, the total sectors cannot exceed the physical capacity of the drive. The total sectors is determined by the following formula:

total sectors = (logical heads) x (logical sectors per track) x (logical cylinders)

To maximize the capacity of the drive, the following geometry is recommended:

	ST3250A	ST3291A
Cylinders	1,024	761
Heads	12	14
Sectors per track	34	50

	ST3391A	ST3491A
Cylinders	768	899
Heads	14	15
Sectors per track	62	62

The drive is configured in translation mode. You can verify the number of cylinders, sectors per track and heads by using the Identify Drive (ECH) command. See the Seagate ATA Interface Reference Manual, publication number 36111-xxx, for details about the Identify Drive command.

1.2 Drive dimensions

Height (max)	1.00 inch (25.4 mm)
Width (max)	4.02 inches (102.1 mm)
Depth (max)	5.77 inches (146.6 mm)
Weight (max)	1.3 lb (0.59 Kg)

ST3491 Family AT Product Manual, Rev. B

3

1.2.1Functional specifications

Interface	AT
Internal data transfer rate (Mbits/sec)	18.7 to 32*
External data transfer rate (Mbytes/sec)	11.1**
Spindle speed ± 0.5% (RPM)	3,811
SeaCacheä buffer (Kbytes)	120
Zone Bit Recording method	RLL (1,7)
Bytes per sector	512
Recording density, max (BPI)	55,200
Flux density, max (FCI)	41,400
Track density, max (TPI)	3,081

*The internal data transfer rate for the ST3491A is 18.7 to 32.

**This is the external data transfer rate during a cache transfer. When the drive is not using the cache, the transfer rate is 5.0 Mbytes per second.

1.3 Reliability

The MTBF specification assumes nominal power at sea level with an ambient temperature of 25°C.

Nonrecoverable errors	1 per 1013 bits read
MTBF	300,000 power on hours
Contact start-stop (CSS)	40,000 cycles
MTTR	30 minutes
Service life	5 years

1.4 Acoustics

Sound pressure is measured at idle from 1 meter above the drive top cover.

Sound pressure, typ	29 dBA
Sound pressure, max	33 dBA

4	ST3491 Family AT Product Manual, Rev. B

1.5 Seek time

All performance measurements are taken 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 25°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 average is determined by measuring 100 full-stroke seeks in both directions.

Model	Track-to-track	Average	Full-stroke	Latency
	typ (msec)	typ (msec)	typ (msec)	(msec)
ST3250A	5	15	34	7.87
ST3291A	5	13	32	7.87
ST3391A	5	14	33	7.87
ST3491A	5	15	34	7.87

1.6 Auto-park

Upon power-down, the read/write heads automatically move to the shipping zone. The heads park inside the maximum data cylinder. When power is applied, the heads recalibrate to track 0.

1.7 Shock and vibration

Shock measurements are based on an 11 msec, half sine wave shock pulse, not to be repeated more than twice per second. The specifications in the table below are defined as follows:

∙During normal operating shock and vibration, the drive sustains no physical damage and reads and writes data without errors.

ST3491 Family AT Product Manual, Rev. B

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∙During abnormal operating shock and vibration, the drive sustains no physical damage, but performance is adversely affected.

∙During nonoperating shock and vibration, the read/write heads are in the shipping zone and the drive sustains no physical damage.

		Normal	Abnormal
		operating	operating	Nonoperating
	Shock	2 Gs	10 Gs	75 Gs
	5–22 Hz vibration	0.020-inch	0.030-inch	0.160-inch
		displacement	displacement	displacement
	22–500 Hz vibration	0.50 Gs	0.75 Gs	4.00 Gs

1.8 Environment

The acceptable environmental conditions for the drive are specified below. The specifications in this section are defined as follows:

∙Operating specifications assume that the drive is powered up.

∙Nonoperating specifications assume that the drive is packaged as it was shipped from the factory.

1.8.1Ambient temperature

Operating	5° to 55°C (41° to 131°F)
Nonoperating	–40° to 60°C (–40° to 140°F)

1.8.2Temperature gradient

Operating (max)	20°C per hour (36°F per hour)
Nonoperating (max)	30°C per hour (54°F per hour)

1.8.3Relative humidity

Operating	8% to 80% noncondensing
	Maximum wet bulb 29.4°C (85.0°F)
Nonoperating	5% to 95% noncondensing
	Maximum wet bulb 40.0°C (104°F)

6	ST3491 Family AT Product Manual, Rev. B

1.8.4Altitude

Operating	–1,000 ft to 10,000 ft (–305 m to 3,050 m)
Nonoperating	–1,000 ft to 40,000 ft (–305 m to 12,200 m)

1.9 Power requirements

Except during a write operation, you can apply power to the drive or remove power from the drive in any sequence without losing data or damaging the drive.

1.9.1Input 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 20 MHz with equivalent resistive loads.

	+5V	+12V
Voltage tolerance	± 5%	± 5%
including noise		± 10% during spinup

1.9.2Start and stop time

After 10 seconds, the drive is ready. Typical and maximum start and stop times are shown in the following table. See Figure 1 on page 8 for the typical startup current profile.

	Typical	Maximum
Start time	7 sec	10 sec
Stop time	6 sec	9 sec