Marathon 810 (ST9816AG) Product Manual, August 1995

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The following commands contain drive-specific features or are not de- scribed in the Draft Proposed ATA-2 Standard.

3.2.2Identify Drive command

The Identify Drive command (command code ECH) 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

 

 

 

 

 

 

 

Configuration information:

 

 

Bit 10: disc transfer > 10 Mbits/sec

 

0

Bit 6: fixed drive

045AH

Bit 4: head switch time > 15 μsec

 

 

 

Bit 3: not MFM encoded

 

 

Bit 1: hard-sectored disc

 

 

 

 

1

Number of fixed cylinders

0623H

(default logical emulation): 1,571

 

 

 

 

 

2

ATA reserved

0000H

 

 

 

3

Number of heads (default logical emulation): 16

0010H

 

 

 

4

Number of unformatted bytes per track (36,240)

8D90H

 

 

 

5

Number of unformatted bytes per sector (584)

248H

 

 

 

6

Number of sectors per track

003FH

(default logical emulation): 63

 

 

 

 

 

7–9

ATA reserved

0000H

 

 

 

10–19

Serial Number:

ASCII

 

(20 ASCII characters, 0000H = none)

 

20

Controller type (dual-port multisector buffer

0003H

with caching)

 

 

 

 

 

21

Buffer size (240 sectors of 512 bytes each)

00F0H

 

 

 

22

Number of ECC bytes available (16)

0010H

 

 

 

 

Firmware revision (8 ASCII character string):

 

23–26

xx = ROM version, ss = RAM version, tt = RAM

xx.ss.tt

 

version

 

 

 

 

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Seagate 810 manual Identify Drive command, Word Description ST9816AG