Identify Device Command - Seagate Surveillance HDD Product Manual

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4.3.1

Identify Device command

The Identify Device command (command code EC
organized as a single 512-byte block of data, whose contents are shown in on page 21. 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.
Table 8 Identify Device commands
Word Description
Configuration information:
Bit 15: 0 = ATA; 1 = ATAPI
0 • Bit 7: removable media
• Bit 6: removable controller
• Bit 0: reserved
1 Number of logical cylinders
2 ATA-reserved
3 Number of logical heads
4 Retired
5 Retired
6 Number of logical sectors per logical track: 63
7–9 Retired
10–19 Serial number: (20 ASCII characters, 0000
20 Retired
21 Retired
22 Obsolete
Firmware revision
23–26
(8 ASCII character string, padded with blanks to end of string)
Drive model number:
27–46
(40 ASCII characters, padded with blanks to end of string)
(Bits 7–0) Maximum sectors per interrupt on Read multiple
47
and Write multiple (16)
48 Reserved
49 Standard Standby timer, IORDY supported and may be disabled
50 ATA-reserved
51 PIO data-transfer cycle timing mode
52 Retired
53 Words 54–58, 64–70 and 88 are valid
54 Number of current logical cylinders
55 Number of current logical heads
56 Number of current logical sectors per logical track
57–58 Current capacity in sectors
Number of sectors transferred during a Read Multiple
59
or Write Multiple command
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
60–61
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
63 Multiword DMA active and modes supported (see note following this table)
64 Advanced PIO modes supported (modes 3 and 4 supported)
65 Minimum multiword DMA transfer cycle time per word (120 nsec)
66 Recommended multiword DMA transfer cycle time per word (120 nsec)
Seagate Surveillance HDD Product Manual, Rev. B (Draft 2)
) transfers information about the drive to the host following power up. The data is
H
= none)
H
SATA Interface
Value
0C5A
H
16,383
0000
H
16
0000
H
0000
H
003F
H
0000
H
ASCII
0000
H
0400
H
0000
H
x.xx
8010
H
0000
H
2F00
H
0000
H
0200
H
0200
H
0007
H
xxxx
H
xxxx
H
xxxx
H
xxxx
H
xxxx
H
0FFFFFFFh*
0000
H
xx07
H
0003
H
0078
H
0078
H
23