Identify Device Command - Seagate Momentus 7200 RPM Product Manual

5.3.1

Identify Device command

The Identify Device command (command code EC
power up. The data is organized as a single 512-byte block of data, whose contents are shown in the table on
page 27. 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. See Section 3.0 on page 4 for default parameter settings.
The following commands contain drive-specific features that may not be included in the Serial ATA specifica-
tion.
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 ATA-reserved
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 Reserved
49 Standard Standby timer, IORDY supported and may be dis-
abled
50 ATA-reserved
51 PIO data-transfer cycle timing mode
52 Retired
53 Words 54–58, 64–70 and 88 are valid
28
) transfers information about the drive to the host following
H
Value
0C5A
16,383
0000
16
0000
0000
003F
0000
= none) ASCII
H
0000
0400
0000
x.xx
ST9750422AS
ST9750421AS
ST9750420AS
ST9750420ASG
ST9640422AS
ST9640421AS
ST9640420AS
ST9640420ASG
ST9500424AS
ST9500423AS
ST9500423ASG
8010
0000
2F00
0000
0200
0200
0007
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
Momentus Product Manual, Rev. A