Seagate Enterprise Value manual Identify Device command, Word Description Value

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4.3.1Identify 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 on page 23. 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 SATA specification.

Word	Description	Value
0	Configuration information:	0C5AH
	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	ATA-reserved	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	0000H
21	Retired	0000H
22	Obsolete	0004H
23–26	Firmware revision	xxxx
	(8 ASCII character string, padded with blanks to end of 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 and Write multiple (16)	8010H
48	Reserved	4000H
49	Standard Standby timer, IORDY supported and may be disabled	2F00H
50	ATA-reserved	4000H
51	PIO data-transfer cycle timing mode	0200H
52	Retired	0200H
53	Words 54–58, 64–70 and 88 are valid	0007H
54	Number of current logical cylinders	xxxxH
55	Number of current logical heads	xxxxH
56	Number of current logical sectors per logical track	xxxxH
57–58	Current capacity in sectors	xxxxH
59	Number of sectors transferred during a Read Multiple	xxxxH
	or Write Multiple command
60–61	Total number of user-addressable LBA sectors available	0FFFFFFFh*
	(see Section 2.2 for related information)
	*Note: The maximum value allowed in this field is: 0FFFFFFFh (268,435,455 sectors,
	137GB). Drives with capacities over 137GB will have 0FFFFFFFh in this field and the
	actual number of user-addressable LBAs specified in words 100-103. This is
	required for drives that support the 48-bit addressing feature.
62	Retired	0000H
63	Multiword DMA active and modes supported	xx07H
	(see note following this table)
64	Advanced PIO modes supported (modes 3 and 4 supported)	0003H
65	Minimum multiword DMA transfer cycle time per word (120 nsec)	0078H
66	Recommended multiword DMA transfer cycle time per word	0078H
	(120 nsec)
67	Minimum PIO cycle time without IORDY flow control (240 nsec)	0078H

Seagate Terascale HDD Product Manual, Rev. B 25