Identify Device Command - Seagate ST92011A - Momentus 20 GB Hard Drive Product Manual

4.1.2

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 2.0 on page 3 for default parameter settings.
The following commands contain drive-specific features that may not be included in the Draft ATA-6 Standard.
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 mul-
tiple (16)
48 Reserved
49 Standard Standby timer, IORDY supported and may be disabled
50 ATA-reserved
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
Momentus 5400.1 Product Manual, Rev. F
) transfers information about the drive to the host following
H
= none)
H
Value
0C5A
H
16,383
0000
H
16
0000
H
0000
H
003F
H
0000
H
ASCII
0000
H
0400
H
0000
H
x.xx
ST94011A
ST92011A
ST94811A
ST92811A
8010
H
0000
H
2F00
H
0000
H
0200
H
0200
H
0007
H
xxxx
H
xxxx
H
xxxx
H
xxxx
H
23