seagate ST3780A, ST31220A Product Manual

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Medalist Family:

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ST3780A, ST31220A

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AT Interface Drives

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Product Manual

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Medalist Family:

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ST3780A, ST31220A

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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. Medalist 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.

Medalist Family AT Product Manual, Rev. A iii

Contents

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

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

1.1.1 ST3780A configurations . . . . . . . . . . . . . . . . . 2

1.1.2 ST31220A configurations . . . . . . . . . . . . . . . . . 2

1.1.3 Physical organization . . . . . . . . . . . . . . . . . . . 2

1.2 Functional specifications . . . . . . . . . . . . . . . . . . . . 3

1.3 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3.1 Multisegmented cache buffer . . . . . . . . . . . . . . . 4

1.4 Start/stop time . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.5 Typical power-up and power-down sequence . . . . . . . . . 5

1.5.1 Power-up sequence . . . . . . . . . . . . . . . . . . . . 5

1.5.2 Power-down sequence . . . . . . . . . . . . . . . . . . 5

1.5.3 Auto-park . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.6 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.7 Physical dimensions . . . . . . . . . . . . . . . . . . . . . . 6

1.8 Environmental specifications . . . . . . . . . . . . . . . . . . 6

1.8.1 Ambient temperature . . . . . . . . . . . . . . . . . . . 6

1.8.2 Temperature gradient . . . . . . . . . . . . . . . . . . . 6

1.8.3 Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.8.4 Relative humidity . . . . . . . . . . . . . . . . . . . . . 7

1.9 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.10 Shock and vibration . . . . . . . . . . . . . . . . . . . . . . 7

1.11 DC Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.11.1 Input noise . . . . . . . . . . . . . . . . . . . . . . . . 8

1.11.2 Power management . . . . . . . . . . . . . . . . . . . 8

1.11.3 Idle and Standby modes . . . . . . . . . . . . . . . . . 9

1.11.4 Power-management modes . . . . . . . . . . . . . . . 9

1.11.5 Power consumption . . . . . . . . . . . . . . . . . . 10

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

iv Medalist Family AT Product Manual, Rev. A

1.13 FCC verification . . . . . . . . . . . . . . . . . . . . . . 12

2.0 Configuring and mounting the drive . . . . . . . . . . . . . 15

2.1 Handling and static-discharge precautions . . . . . . . . . 15

2.2 I/O cable and connector . . . . . . . . . . . . . . . . . . 16

2.3 Remote LED connection . . . . . . . . . . . . . . . . . . 17

2.4 Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.4.1 Jumper sizes . . . . . . . . . . . . . . . . . . . . . . 17

2.4.2 Dual-drive emulation jumper block (J6) . . . . . . . . . 19

2.4.3 Master/slave configuration . . . . . . . . . . . . . . . 19

2.5 Cable select option . . . . . . . . . . . . . . . . . . . . . 20

2.6 Mounting the drive . . . . . . . . . . . . . . . . . . . . . . 21

3.0 AT interface . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.1 Command set . . . . . . . . . . . . . . . . . . . . . . . . 23

3.1.1 Identify Drive command (EC

3.1.2 Set Features command (EF

3.1.3 Sleep command (99

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

) . . . . . . . . . . . . . 25

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

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

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

Medalist Family AT Product Manual, Rev. A v

Figures

Figure 1. Typical startup current profile . . . . . . . . . . . . . 11

Figure 2. AT interface connector . . . . . . . . . . . . . . . . . 16

Figure 3. Configuration jumpers . . . . . . . . . . . . . . . . . 18

Figure 4. Connecting cable-selected drives . . . . . . . . . . . 20

Figure 5. Mounting dimensions . . . . . . . . . . . . . . . . . . 22

Figure 6. AT interface connector pin assignments . . . . . . . 30

Figure 7. Programmed I/O timing without IORDY . . . . . . . . 31

Figure 8. Programmed I/O timing with IORDY . . . . . . . . . . 32

Figure 9. Multiword DMA timing . . . . . . . . . . . . . . . . . 33

Medalist Family AT Product Manual, Rev. A 1

1.0 Specifications

1.1 Formatted capacity

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

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

The amount of disc space that your computer can access depends on the type of computer you have and the type of operating system or third-party installation software that is used to high-level format ST31220 family drives.

Your computer may support one of two addressing schemes to access data on a hard disc—

logical block addressing (LBA) or cylinder-head-

sector addressing (CHS). LBA allows you to access the full capacity of your hard disc. CHS, which is used on older DOS systems, limits the capacity of your hard disc to 1,024 cylinders (approximately 512 Mbytes) unless:

) command. See

• You are using third-party installation software that supports more than 1,024 cylinders.

• You have configured your system to support dual-drive emulation (see page 19).

• You have a host adapter (controller card) that supports more than 1,024 cylinders.

The relationship between sectors, heads and cylinders and the total number of sectors per drive is shown in the following equation:

(sectors) × (heads) × (cylinders)

< total sectors per drive

2 Medalist Family AT Product Manual, Rev. A

1.1.1 ST3780A configurations

CHS LBA

Cylinders 1,399 N/A Heads 16 N/A Sectors 63 N/A Total sectors 1,410,192 1,410,864 Formatted capacity (Mbytes

1. One Mbyte equals one million bytes.

) 722.02 722.36

1.1.2 ST31220A configurations

CHS LBA

Cylinders 2,099 N/A Heads 16 N/A Sectors 63 N/A Total sectors 2,115,792 2,116,296 Formatted capacity (Mbytes

) 1,083.2 1,083.5

1. One Mbyte equals one million bytes.

1.1.3 Physical organization

ST3780A ST31220A

Read/write heads 4 6 Discs 2 3

Medalist Family AT Product Manual, Rev. A 3

1.2 Functional specifications

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

DMA Mode 2 (Mbytes per sec) External data burst transfer rate,

PIO Mode 4 (Mbytes per sec) Internal data transfer rate

(Mbits per sec) Spindle speed (RPM) 4,500 ± 0.5% Cache size (Kbytes) 256 Cylinders 3,876 Bytes per sector 512 Recording density, max (BPI) 70,101 Track density (TPI) 4,250

1. The drives achieve this external transfer rate when using multiword DMA mode 2; see Figure 9 on page 33.

16.6

27.92 to 47.24

2. See Figure 8 on page 32.

4 Medalist Family AT Product Manual, Rev. A

1.3 Seek time

Seek time 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 5,000 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

3.5 msec typ

4.5 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/typical seek time

12.0 msec read

14.0 msec write

Full-stroke seek time

25.0 msec typ

27.0 msec max

Average latency

6.67 msec

1.3.1 Multisegmented cache buffer

The drive uses the 256-Kbyte multisegmented cache buffer to improve performance by eliminating access times under certain conditions.

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 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.

Medalist Family AT Product Manual, Rev. A 5

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 magnetic actuator-lock releases the actuator.

5. The drive achieves final speed-control lock.

6. The heads are positioned over 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 magnetic actuator-lock locks the arm. This completes the powerdown 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 magnetic actuator-lock engages. When power is applied, the heads recalibrate to track 0.

6 Medalist Family AT Product Manual, Rev. A

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 Contact Start/Stop 40,000 cycles MTBF 300,000 power-on hours Service life 5 years

bits transferred

physical seeks

1.7 Physical dimensions

The mounting dim ensions are shown in Figure 5 on page 22. 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 70°C (–40°F to 158°F)

1.8.2 Temperature gradient

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

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