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Momentus Product Manual, Rev. D 27
5.3.1 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 (for ST9640320AS, ST9500320AS, ST9320310AS,
ST9250310AS and ST9160316AS models) or 4096-byte (for ST9640322AS, ST9320312AS and
ST9400321AS models) block of data, whose contents are shown in the table on page 27. 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.
The following commands contain drive-specific features that may not be included in the Serial ATA specifica-
tion.
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)
ST9640322AS
ST9640320AS
ST9500320AS
ST9400321AS
ST9320312AS
ST9320310AS
ST9250310AS
ST9160316AS
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 dis-
abled
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