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Seagate Terascale HDD Product Manual, Rev. B 25
www.seagate.com
4.3.1 Identify Device command
The Identify Device command (command code EC
H
) 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:
Bit 15: 0 = ATA; 1 = ATAPI
• Bit 7: removable media
• Bit 6: removable controller
• Bit 0: reserved
0C5A
H
1 Number of logical cylinders 16,383
2 ATA-reserved C837
H
3 Number of logical heads 16
4 Retired 0000
H
5 Retired 0000
H
6 Number of logical sectors per logical track: 63 003F
H
7–9 Retired 0000
H
10–19 Serial number: (20 ASCII characters, 0000
H
= none) ASCII
20 Retired 0000
H
21 Retired 0000
H
22 Obsolete 0004
H
23–26 Firmware revision
(8 ASCII character string, padded with blanks to end of string)
xxxx
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) 8010
H
48 Reserved 4000
H
49 Standard Standby timer, IORDY supported and may be disabled 2F00
H
50 ATA-reserved 4000
H
51 PIO data-transfer cycle timing mode 0200
H
52 Retired 0200
H
53 Words 54–58, 64–70 and 88 are valid 0007
H
54 Number of current logical cylinders xxxx
H
55 Number of current logical heads xxxx
H
56 Number of current logical sectors per logical track xxxx
H
57–58 Current capacity in sectors xxxx
H
59 Number of sectors transferred during a Read Multiple
or Write Multiple command
xxxx
H
60–61 Total number of user-addressable LBA sectors available
(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.
0FFFFFFFh*
62 Retired 0000
H
63 Multiword DMA active and modes supported
(see note following this table)
xx07
H
64 Advanced PIO modes supported (modes 3 and 4 supported) 0003
H
65 Minimum multiword DMA transfer cycle time per word (120 nsec) 0078
H
66 Recommended multiword DMA transfer cycle time per word
(120 nsec)
0078
H
67 Minimum PIO cycle time without IORDY flow control (240 nsec) 0078
H