Seagate ST9750423AS, ST9750422AS, ST9750424AS Identify Device command, Word Description Value

5.3.1Identify Device command

The Identify Device command (command code ECH) transfers information about the drive to the host following 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 3.0 on page 4 for default parameter settings.

The following commands contain drive-specific features that may not be included in the Serial ATA specifica- tion.

Word	Description	Value
	Configuration information:	0C5AH
0	• Bit 15: 0 = ATA; 1 = ATAPI
	• Bit 7: removable media
	• Bit 6: removable controller
	• Bit 0: reserved
1	Number of logical cylinders	16,383
2	Specific configuration	C837H
3	Number of logical heads	16
4	Retired	0000H
5	Retired	0000H
6	Number of logical sectors per logical track: 63	003FH
7–9	Retired	0000H
10–19	Serial number: (20 ASCII characters, 0000H = none)	ASCII
20	Retired	8000H
21	Retired	0004H
22	Obsolete	0000H
23–26	Firmware revision (8 ASCII character string, padded with	x.xx
	blanks to end of string)
27–46	Drive model number: (40 ASCII characters, padded with	ST9750423AS
	blanks to end of string)	ST9750423ASG
		ST9750422AS
		ST9750420AS
		ST9750420ASG
		ST9640424AS
		ST9640423AS
		ST9640423ASG
		ST9500424AS
		ST9500423AS
		ST9500423ASG
47	(Bits 7–0) Maximum sectors per interrupt on Read multiple	8010H
	and Write multiple (16)
48	Reserved	0000H
49	Standard Standby timer, IORDY supported and may be dis-	2F00H
	abled
50	Capabilities	4000H
51	PIO data-transfer cycle timing mode	0200H
52	Retired	0200H
53	Words 54–58, 64–70 and 88 are valid	0007H

26 Momentus Product Manual, Rev. C