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2 identify device command, Identify device command – Seagate MOMENTUS 5400.3 ST9160821AB User Manual

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Momentus 5400.3 PATA Blade Server Product Manual, Rev. B

29

4.1.2

Identify Device command

The Identify Device command (command code EC

H

) transfers information about the drive to the host following

power up. The data is organized as a single 512-byte block of data, whose contents are shown in Table 6 on
page 26. 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 2.0 on page 3 for default parameter settings.

The following commands contain drive-specific features that may not be included in the Draft ATA-6 Standard.

Word

Description

Value

0

Configuration information:

• Bit 15: 0 = ATA; 1 = ATAPI

• Bit 7: removable media

• Bit 6: removable controller

• Bit 0: reserved

0C5A

H

1

Number of logical cylinders

16,383

2

ATA-reserved

0000

H

3

Number of logical heads

16

4

Retired

0000

H

5

Retired

0000

H

6

Number of logical sectors per logical track: 63

003F

H

7–9

Retired

0000

H

10–19

Serial number: (20 ASCII characters, 0000

H

= none)

ASCII

20

Retired

0000

H

21

Retired

0400

H

22

Obsolete

0000

H

23–26

Firmware revision

(8 ASCII character string, padded with blanks to end of string)

x.xx

27–46

Drive model number (40 ASCII characters, padded with blanks
to end of string)

ST9160821AB

ST9120822AB

ST9100828AB

ST980815AB

ST960815AB

ST9402116AB

47

(Bits 7–0) Maximum sectors per interrupt on Read multiple and
Write multiple (16)

8010

H

48

Reserved

0000

H

49

Standard Standby timer, IORDY supported and may be disabled

2F00

H

50

ATA-reserved

0000

H

51

PIO data-transfer cycle timing mode

0200

H

52

Retired

0200

H

53

Words 54–58, 64–70 and 88 are valid

0007

H

54

Number of current logical cylinders

xxxx

H

55

Number of current logical heads

xxxx

H

56

Number of current logical sectors per logical track

xxxx

H