Seagate 810 manual Identify Drive command, Word Description ST9816AG

Marathon 810 (ST9816AG) Product Manual, August 1995 25

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