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EE25.2 Series Product Manual, Rev. B
37
4.4 Identify Device command
The Identify Device command (command code EC
H
) transfers information about the drive to the host following
power up. The data, shown below, is organized as a single 512-byte block of data. 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 ATA-6 Standard.
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 ATA-reserved 0000
H
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 0400
H
22 Obsolete 0000
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)
ST980817AM
ST980818AM
ST980817SM
ST980818SM
ST960817AM
ST960818AM
ST960817SM
ST960818SM
ST940817AM
ST940818AM
ST940817SM
ST940818SM
ST930817AM
ST930818AM
ST930817SM
ST930818SM
47 (Bits 7–0) Maximum sectors per interrupt on Read multiple and
Write multiple (16)
8010
H
48 Reserved 0000
H
49 Standard Standby timer, IORDY supported and may be disabled 2F00
H
50 ATA-reserved 0000
H
51 PIO data-transfer cycle timing mode 0200
H
52 Retired 0200
H