M
OMENTUS
T
HIN
SATA P
RODUCT
M
ANUAL
, R
EV
. B
20
S
ERIAL
ATA (SATA) I
NTERFACE
4.3.1
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 3
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)
ST500LM021
ST320LM010
47
(Bits 7–0)
Maximum sectors per interrupt on Read multiple and Write multiple (16)
8010
H
48
Trusted Computing Feature set options
0000
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
57–58
Current capacity in sectors
xxxx
H
59
Number of sectors transferred during a
Read Multiple or Write Multiple command
xxxx
H
