seagate ST3655A, ST3550A, ST3390A Product Manual

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ST3655 Family:

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ST3390A, ST3550A, ST3655A

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AT Interface Drives

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Product Manual

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ST3655 Family:

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ST3390A, ST3550A, ST3655A

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AT Interface Drives

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Product Manual

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Seagate

, Seagate Technology® and the Seagate 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.

ST3655 Family AT Drives Product Manual, Rev. A iii

Contents

1.0 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . 1

1.1.1 Recommended logical configuration . . . . . . . . . . . 1

1.1.2 Physical organization . . . . . . . . . . . . . . . . . . . 2

1.2 Functional specifications . . . . . . . . . . . . . . . . . . . 2

1.3 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.3.1 Thermal compensation . . . . . . . . . . . . . . . . . . 3

1.3.2 Multisegmented cache buffer . . . . . . . . . . . . . . . 3

1.4 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.5 Typical power-up and power-down sequence . . . . . . . . . 4

1.5.1 Power-up sequence . . . . . . . . . . . . . . . . . . . 4

1.5.2 Power-down sequence . . . . . . . . . . . . . . . . . . 4

1.5.3 Auto-park . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.6 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.7 Physical dimens ions . . . . . . . . . . . . . . . . . . . . . . 5

1.8 Environmental specifications . . . . . . . . . . . . . . . . . 5

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

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

1.8.3 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.8.4 Relative humidity . . . . . . . . . . . . . . . . . . . . . 6

1.9 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.10 Shock and vibration . . . . . . . . . . . . . . . . . . . . . 6

1.11 DC power . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.11.1 Input noise . . . . . . . . . . . . . . . . . . . . . . . . 7

1.11.2 Power management . . . . . . . . . . . . . . . . . . . 7

1.11.3 Idle and standby timers . . . . . . . . . . . . . . . . . 7

1.11.4 Power-management modes . . . . . . . . . . . . . . . 8

1.11.5 Power consumption . . . . . . . . . . . . . . . . . . . 9

iv ST3655 Family AT Drives Product Manual, Rev. A

1.12 Agency listings . . . . . . . . . . . . . . . . . . . . . . . 11

1.13 FCC verification . . . . . . . . . . . . . . . . . . . . . . 11

2.0 Configuring and mounting the drive . . . . . . . . . . . . . 13

2.1 Handling and static-discharge precautions . . . . . . . . . 13

2.2 I/O cable and connector . . . . . . . . . . . . . . . . . . 14

2.3 Remote LED connection . . . . . . . . . . . . . . . . . . 15

2.4 Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.4.1 Jumper sizes . . . . . . . . . . . . . . . . . . . . . . 15

2.4.2 Factory test jumper block (J6) . . . . . . . . . . . . . 15

2.4.3 Master/slave configuration . . . . . . . . . . . . . . . 17

2.5 Cable select option . . . . . . . . . . . . . . . . . . . . . 18

2.6 Spindle synchronization option . . . . . . . . . . . . . . . 20

2.7 Mounting the drive . . . . . . . . . . . . . . . . . . . . . . 22

3.0 AT interface . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.1 Command set . . . . . . . . . . . . . . . . . . . . . . . . 25

3.1.1 Identify Drive command (EC

3.1.2 Set Features command (EF

3.1.3 Sleep command (99

, E6H) . . . . . . . . . . . . . . 29

) . . . . . . . . . . . . . 27

) . . . . . . . . . . . . . 29

3.2 AT Interface connector pin assignments . . . . . . . . . . 29

Appendix. Timing diagrams . . . . . . . . . . . . . . . . . . . . 31

ST3655 Family AT Drives Product Manual, Rev. A v

Figures

Figure 1. Typical startup current profile . . . . . . . . . . . . . . . 10

Figure 2. AT interface connector . . . . . . . . . . . . . . . . . . 14

Figure 3. Configuration jumper s . . . . . . . . . . . . . . . . . . . 16

Figure 4. Connecting cable-selected drives . . . . . . . . . . . . . 19

Figure 5. Connecting synchronized drives . . . . . . . . . . . . . . 21

Figure 6. Spindle synchronization timing . . . . . . . . . . . . . . 21

Figure 7. Recommended mounting orientations . . . . . . . . . . . 23

Figure 8. Mounting dimensions . . . . . . . . . . . . . . . . . . . 24

Figure 9. AT interface connector pin assignments . . . . . . . . . 30

Figure 10. Programmed I/O timing without IORDY . . . . . . . . . 31

Figure 11. Programmed I/O timing with IORDY . . . . . . . . . . . 32

Figure 12. Multiword DMA timing . . . . . . . . . . . . . . . . . . 33

ST3655 Family AT Drives Product Manual, Rev. A 1

1.0 Specifications

1.1 Formatted capacity

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

ST3390A ST3550A ST3655A

Formatted capacity (Mbytes*) 341.311 452.415 528.482 Total sectors 666,624 883,624 1,032,192

* One megabyte equals one million bytes.

1.1.1 Recommended 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:

≤

(sectors per track)(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) (logical sectors per track) (logical cylinders) To maximize the capacity of the drive, the following geometry is recom-

mended:

ST3390A ST3550A ST3655A

Cylinders 768 1,018 1,024 Read/write heads 14 14 16 Sectors per track 62 62 63

The drive is configured in translation mode. You can verify the number of cylinders, sectors per track and heads by using the Identify Drive (EC command. See Section 3.1.1 for details about the Identify Drive command.

)

2 ST3655 Family AT Drives Product Manual, Rev. A

1.1.2 Physical organization

ST3390A ST3550A ST3655A

Read/write heads 3 5 5 Servo heads 1 1 1 Discs 2 3 3

1.2 Functional specifications

Interface AT Zone Bit Recording method RLL (1,7) External data burst transfer rate

(Mbytes per sec) Internal data transfer rate

(Mbits per sec) Spindle speed (RPM) 4,500 ± 0.5% Cache size (Kbytes) 256 Bytes per sector 512 Recording density, max (BPI) 53,192** Track density (TPI) 3,000** * The drives achieve this external transfer rate when using programmed

I/O with IORDY, as shown in Figure 11 on page 32.

** The ST3550A has a recording density of 52,602 bits per inch and a

track density of 2,400 tracks per inch.

11.1*

21.6 to 36.56

1.3 Seek time

Seek time is a true statistical average of at least 5,000 measurements of seek time. All measurements are 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.

ST3655 Family AT Drives Product Manual, Rev. A 3

Track-to-track seek time

3.5 msec typ

4.0 msec max 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.

Average seek time

12.0 msec typ

14.0 msec max

Full-stroke seek time

30.0 msec typ

32.0 msec max

Average latency

6.67 msec

1.3.1 Thermal compensation

The thermal compensation feature compensates for position offset of the selected head because of variations in temperature. The drive automatically compensates for thermal offset every 30 seconds for the first 30 minutes of operation and every 1.5 minutes thereafter. The drive performs this automatic compensation while executing a command from the computer.

You can pre-empt the automatic compensation by issuing a Recalibrate command. The drive performs a thermal compensation, sets a timer and waits 2 minutes before performing the automatic compensation again.

Thermal compensation increases the execution time of the command during which it is performed by 100 msec (typ) to 350 msec (max).

1.3.2 Multisegmented cache buffer

The drive uses the cache buffer to improve performance by eliminating access times under certain conditions. The cache buffer contains four 64-Kbyte segments of RAM (one for writing and three for reading) for a total capacity of 256 Kbytes.

Read look-ahead. The drive uses the read segments to store additional logical sectors, after the last requested sector, into a buffer before the additional sectors are requested by the computer. The cache buffer stores data from the start of a read until the buffer segment is full, or until another command is received from the computer.

Write immediate. The drive uses the write segment to store write commands and data. After the drive receives all 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.

4 ST3655 Family AT Drives Product Manual, Rev. A

1.4 Start/stop time

Within 20 seconds after DC power is applied, the drive is ready. Within 15 seconds after DC power is removed, the drive spindle stops rotating.

1.5 Typical power-up and power-down sequence

The typical power-up and power-down sequences assist you in evaluating the drive’s performance; they are not performance specifications.

1.5.1 Power-up sequence

1. Power is applied to the drive.

2. When power is applied, the LED is on for about 1 second.

3. The spindle motor reaches operating speed in about 4 seconds.

4. The arm-lock solenoid releases the arm, making an audible sound.

5. The drive performs velocity adjustment seeks.

6. The heads are positioned ov er track 0 and the drive is ready.

1.5.2 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 3 seconds, the motor begins to spin down.

3. The read/write heads automatically move to the shipping zone, which

is inside the maximum data cylinder.

4. The arm-lock solenoid locks the arm, making an audible sound. This

completes the power-down sequence.

1.5.3 Auto-park

Upon power-down, the read/write heads automatically move to the shipping zone. The heads park inside the maximum data cylinder and the arm-lock solenoid engages, making an audible sound. When power is applied, the heads recalibrate to track 0.

ST3655 Family AT Drives Product Manual, Rev. A 5

1.6 Reliability

Read error rates are measured with automatic retries and data correction with ECC enabled and all flaws re-allocated. The mean time between failures (MTBF) is measured at nominal power at sea level and an ambient temperature of 40°C.

Nonrecoverable read errors 1 per 10 Seek errors 1 per 10 MTBF 250,000 power-on hours Service life 5 years

bits transferred

physical seeks

1.7 Physical dimensions

The mounting dim ensions are shown in Figure 8 on page 24. 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 1.5 lb (0.68 Kg)

1.8 Environmental specifications

1.8.1 Ambient temperature

Operating 5°C to 55°C (41°F to 131°F) Nonoperating –40°C to 65°C (–40°F to 149°F)

1.8.2 Temperature gradient

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

1.8.3 Altitude

Operating –1,000 ft to 10,000 ft (–305 m to 3,048 m) Nonoperating –1,000 ft to 40,000 ft (–305 m to 12,192 m)

6 ST3655 Family AT Drives Product Manual, Rev. A

1.8.4 Relative humidity

Operating 8% to 80% noncondensing

Maximum wet bulb 26°C (79°F)

Maximum operating gradient

Nonoperating 5% to 95% noncondensing

10% per hour

Maximum wet bulb 26°C (79°F)

1.9 Acoustics

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

Sound pressure, typ (dBA) 34 Sound pressure, max (dBA) 38

1.10 Shock and vibration

All shock and vibration specifications assume that the drive is mounted in a recommended orientation (see Figure 7 on page 23) 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 damage to the drive or performance degradation. During nonoperating shock and vibration, the read/write heads are positioned in the shipping zone.

Operating Nonoperating

Shock 2 Gs 75 Gs 5–22 Hz vibration 0.020-inch

displacement

22–500 Hz vibration 0.50 Gs 4.00 Gs

0.020-inch displacement

+ 30 hidden pages