28 ST1.3 Series Product Manual, Rev. C

4.1.2 Identify Device command

The Identify Device command (command code ECH) 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 the table on

page 28. 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-7 Standard.

Word ATA specification Value
0
Configuration information:
• Bit 15: 0 = ATA; 1 = ATAPI
• Bit 7: removable media
• Bit 6: removable controller
• Bit 0: reserved
848AH
1Number of logical cylinders 16,383
2ATA-reserved 0000H
3Number of logical heads 16
4-5 Retired 0000H
6Number of logical sectors per logical track 003FH
7-9 Retired 0000H
10–19 Serial number: (20 ASCII characters, 0000H = none) ASCII
20 Retired 0003H
21 Retired 0100H
22 Obsolete 0004H
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)
ST612712DEG,
ST612712DE,
ST610712DEG,
ST610712DE,
ST680712DEG,
ST680712DE,
ST660712DEG,
ST660712DE
47 (Bits 7–0) Maximum sectors per interrupt on Read multiple and Write multiple (16) 8010H
48 Reserved 0000H
49 Standard Standby timer, IORDY supported and may be disabled 0B00H
50 ATA-reserved 0000H
51 PIO data-transfer cycle timing mode 0200H
52 Retired 0200H
53 Words 54-58, 64–70 and 88 valid 0007H
54 Number of current logical cylinders xxxxH
55 Number of current logical heads xxxxH
56 Number of current logical sectors per logical track xxxxH
57-58 Current capacity in sectors xxxxH