Barracuda SATA Product Manual, Rev. B 35
www.seagate.com Serial ATA (SATA) Interface
4.3.1 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 on page 32. 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 specification.
Word Desc riptio n Value
0 Configuration information:
• Bit 15: 0 = ATA; 1 = ATAPI
• Bit 7: removable media
• Bit 6: removable controller
• Bit 0: reserved
0C5AH
1 Number of logical cylinders 16,383
2 ATA-reserved 0000H
3 Number of logical heads 16
4 Retired 0000H
5 Retired 0000H
6 Number of logical sectors per logical track: 63 003FH
7–9 Retired 0000H
10–19 Serial number: (20 ASCII characters, 0000H = none) ASCII
20 Retired 0000H
21 Retired 0400H
22 Obsolete 0000H
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)
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
2F00H
50 ATA-reserved 0000H
51 PIO data-transfer cycle timing mode 0200H
52 Retired 0200H
53 Words 54–58, 64–70 and 88 are valid 0007H
54 Number of current logical cylinders xxxxH
55 Number of current logical heads xxxxH