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The following commands contain drive-specific features or are not de-
scribed in the
Draft Proposed ATA-2 Standard.
3.2.2 Identify Drive command
The Identify Drive command (command code EC
H
) transfers information
about the drive to the host after 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. See
Section 1 of this manual for default parameter settings for the ST9816AG.
Word Description ST9816AG
0
Configuration information:
• Bit 10: disc transfer > 10 Mbits/sec
• Bit 6: fixed drive
• Bit 4: head switch time > 15 µsec
• Bit 3: not MFM encoded
• Bit 1: hard-sectored disc
045A
H
1
Number of fixed cylinders
(default logical emulation): 1,571
0623
H
2 ATA reserved 0000
H
3 Number of heads (default logical emulation): 16 0010
H
4 Number of unformatted bytes per track (36,240) 8D90
H
5 Number of unformatted bytes per sector (584) 248
H
6
Number of sectors per track
(default logical emulation): 63
003F
H
7–9 ATA reserved 0000
H
10–19
Serial Number:
(20 ASCII characters, 0000
H
= none)
ASCII
20
Controller type (dual-port multisector buffer
with caching)
0003
H
21 Buffer size (240 sectors of 512 bytes each) 00F0
H
22 Number of ECC bytes available (16) 0010
H
23–26
Firmware revision (8 ASCII character string):
xx
= ROM version,
ss
= RAM version,
tt
= RAM
version
xx.ss.tt
Marathon 810 (ST9816AG) Product Manual, August 1995 25