Seagate ST240FP0001, ST120FP0001, ST100FP0021, ST100FP0001 manual Identify Device command, 3FFFH

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 in Table 11 on page 24. 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 2.0 on page 3 for default parameter settings.

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

WORD	DESCRIPTION	VALUE
0	General configuration	0C5AH
1	Number of logical cylinders (obsolete) 16,383	3FFFH
2	Specific configuration	C837H
3	Number of logical heads (obsolete) 16	0010H
4-5	Retired	0000H
6	Number of logical sectors per logical track (obsolete) 63	003FH
7–8	Reserved for CompactFlash Association	0000H
9	Retired	0000H
10–19	Serial number: (ATA ASCII string padded with spaces (20H))	ASCII
20-21	Retired	0000H
22	Obsolete	0004H
23–26	Firmware revision (ATA ASCII string padded with spaces (20h))	ASCII
27–46	Model number (ATA ASCII string padded with spaces (20h))	ASCII
47	(Bits 7-0) Maximum number of logical sectors that shall be transferred	8010H
	per DRQ data block on READ/WRITE MULTIPLE commands. 16
48	Reserved for Trusted Computing feature set options	4000H
49	Capabilities – Standby Timer, IORDY Support, etc	2F00H
50	Capabilities Continued	4000H
51	PIO data transfer cycle timing option (Obsolete)	0200H
52	Retired	0200H
53	Words 54–58, 64–70 and 88 are valid	0006H
54	Number of current logical cylinders (Obsolete)	3FFFH
55	Number of current logical heads (Obsolete)	0010H
56	Number of current logical sectors per logical track (Obsolete)	003FH
57–58	Current capacity in sectors (Obsolete)	FC10H 00FBH
59	Number of LBAs transferred per Read Multiple or Write Multiple.	0010H
	Sanitize Command Support
60–61	Total number of user addressable logical sectors for 28-bit commands	XXXXXXXXH*
	Note: The maximum value allowed in this field is: 0FFFFFFFh. If this
	field contains 0FFFFFFFh and the device has user addressable LBAs
	greater than or 137GB, then words 100..103 contain the total number
	of user addressable LBAs
62	Obsolete	0000H
63	Multiword DMA active and modes supported	0407H
	(see note following this table)
64	Advanced PIO modes supported. SATA = 0003h	0003H
65	Minimum Multiword DMA transfer cycle time per word (120ns)	0078H
66	Recommended Multiword DMA transfer cycle time (120ns)	0078H
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