Identify Device Command - Seagate ST9500421AS Product Manual

4.2.5

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
below. 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 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
Momentus 7200 FDE.2 SATA Product Manual, Rev. A
) transfers information about the drive to the host following
H
Value
0C5A
16,383
C837
16
0000
H
0000
H
003F
H
0000
H
= none) ASCII
H
0000
H
8000
H
0004
H
x.xx
ST9500421AS
ST9500426ASG
ST9320426AS
ST9320426ASG
ST9250411AS
ST9250464ASG
ST9160413AS
ST9160418ASG
8001
H
4001
H
2F00
H
4000
H
0200
H
0200
H
0007
H
H
H
33