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4.3.1
Identify Device command
The Identify Device command (command code EC
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
The following commands contain drive-specific features that may not be included in the Serial ATA specification.
Table 10 Identify Device command
Word
Description
Configuration information:
• Bit 15: 0 = ATA; 1 = ATAPI
0
• Bit 7: removable media
• Bit 6: removable controller
• Bit 0: reserved
1
Number of logical cylinders
2
Specific configuration
3
Number of logical heads
4
Retired
5
Retired
6
Number of logical sectors per logical track: 63
7–9
Retired
10–19
Serial number: (20 ASCII characters, 0000
20
Retired
21
Retired
22
Obsolete
23–26
Firmware revision: (8 ASCII character string, padded with blanks to end of string)
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)
48
Trusted Computing Feature set options
49
Standard Standby timer, IORDY supported and may be disabled
50
Capabilities
51
PIO data-transfer cycle timing mode
52
Retired
53
Words 54–58, 64–70 and 88 are valid
54
Number of current logical cylinders
55
Number of current logical heads
56
Number of current logical sectors per logical track
57–58
Current capacity in sectors
59
Number of sectors transferred during a Read Multiple or Write Multiple command
Seagate BarraCuda Product Manual, Rev. J
) transfers information about the drive to the host following power up. The data is organized as
H
Drive Specifications Summary
= none)
H
on page 7 for default parameter settings.
Value
0C5A
H
16,383
C837H
16
0000
H
0000
H
003F
H
0000
H
ASCII
0000
H
8000
H
0004
H
x.xx
ST5000LM000-2U8170
ST4000LM024-2U817V
8010
H
4001
H
2F00
H
4000
H
0200
H
0200
H
0007
H
xxxx
H
xxxx
H
xxxx
H
xxxx
H
xxxx
H
22
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