Seagate ST33000651AS, ST32000641AS manual Identify Device command, Word Description Value

www.seagate.com	SATA Interface
Table 7 Supported ATA commands (continued)
Command name	Command code (in hex)
Write Log Extended	3FH
Write Multiple	C5H
Write Multiple Extended	39H
Write Multiple FUA Extended	CEH
Write Sectors	30H
Write Sectors Without Retries	31H
Write Sectors Extended	34H
Write Uncorrectable	45H

4.3.1 Identify 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 on page 29. 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.

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

Word	Description	Value
	Configuration information:
	• Bit 15: 0 = ATA; 1 = ATAPI
0	• Bit 7: removable media	0C5AH
	• Bit 6: removable controller
	• Bit 0: reserved
1	Number of logical cylinders	16,383
2	ATA-reserved	0000H
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	0000H
21	Retired	0400H
22	Obsolete	0000H
	Firmware revision
23–26	(8 ASCII character string, padded with blanks to end of	x.xx
	string)
27–46	Drive model number:
	(40 ASCII characters, padded with blanks to end of string)
47	(Bits 7–0) Maximum sectors per interrupt on Read multiple	8010H
	and Write multiple (16)

Barracuda XT SATA Product Manual, Rev. D 31