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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 Table 6 on page 23. 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 SATA specification.
Table 7
Identify Device commands
Word
Description
Value
0
0C5AH
Configuration information:
• Bit 15: 0 = ATA; 1 = ATAPI
• Bit 7: removable media
• Bit 6: removable controller
• Bit 0: reserved
1
Number of logical cylinders
16,383
Specific configuration:
2
C837H
37C8h Device requires SET FEATURES subcommand to spin-up after power-up
and IDENTIFY DEVICE data is incomplete.
738Ch Device requires SET FEATURES subcommand to spin-up after power-up
and IDENTIFY DEVICE data is complete.
8C73h Device does not require SET FEATURES subcommand to spin-up after
power-up and IDENTIFY DEVICE data is incomplete.
C837h Device does not require SET FEATURES subcommand to spin-up after
power-up and IDENTIFY DEVICE data is complete.
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
Trusted Computing feature set options:
48
4000H
15
Shall be cleared to zero
14
Shall be set to one
13:1 Reserved for the Trusted Computing Group
0
Trusted Computing feature set is supported
49
Standard Standby timer, IORDY supported and may be disabled
2F00H
Capabilities: (see 7.17.7.17)
50
4000H
15 Shall be cleared to zero
14 Shall be set to one
13:2 Reserved
1 Obsolete
0 Shall be set to one to indicate a vendor specific Standby timer value minimum
Seagate SkyHawk Product Manual, Rev. A
25