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Momentus 4200.2 Product Manual, Rev. D

4.1.2 Identify Device command

The Identify Device command (command code EC

) 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 7 on

page 20. 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

1 Number of logical cylinders 16,383

2 ATA-reserved 0000

3 Number of logical heads 16

4 Retired 0000

5 Retired 0000

6 Number of logical sectors per logical track: 63 003F

7–9 Retired 0000

10–19 Serial number: (20 ASCII characters, 0000

= none) ASCII

20 Retired 0000

21 Retired 0400

22 Obsolete 0000

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)

ST9100822A

ST9808210A

ST960821A

ST950212A

ST9402113A

ST930219A

47 (Bits 7–0) Maximum sectors per interrupt on Read multiple

and Write multiple (16)

8010

48 Reserved 0000

49 Standard Standby timer, IORDY supported and may be

disabled

2F00

50 ATA-reserved 0000

51 PIO data-transfer cycle timing mode 0200

52 Retired 0200

53 Words 54–58, 64–70 and 88 are valid 0007

54 Number of current logical cylinders xxxx

55 Number of current logical heads xxxx

56 Number of current logical sectors per logical track xxxx

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 43 44

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