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ANUAL
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25
S
ERIAL
ATA (SATA) I
NTERFACE
6.3.1
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 block of data, whose contents are shown in
Table 10
. 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. Refer to
Drive Specifications
on page 4 for default
parameter settings.
The following commands contain drive-specific features that may not be included in the Serial ATA specification.
Table 10 Identify Device command
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
Specific configuration
C837H
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
8000
H
22
Obsolete
0004
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)
ST500LT012
ST500LT015
ST500LT025
ST500LT034
ST320LT012
ST320LT015
ST320LT025
ST320LT032
ST250LT012
ST250LT015
ST250LT025
ST250LT028
47
(Bits 7–0)
Maximum sectors per interrupt on Read multiple and Write multiple (16)
8010
H
48
Trusted Computing Feature set options
4001
H
49
Standard Standby timer, IORDY supported and may be disabled
2F00
H
50
Capabilities
4000
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
