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Seagate Barracuda 7200.11 Serial ATA Manual

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Barracuda 7200.11 Serial ATA Product Manual, Rev. E 31
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 in Table 9 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. 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 specifica-
tion.
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 0000
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 0400
H
22 Obsolete 0000
H
23–26
Firmware revision (8 ASCII character string, padded with blanks to end
of string)
x.xx
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 0000
H
49 Standard Standby timer, IORDY supported and may be disabled 2F00
H
50 ATA-reserved 0000
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
… 37 …


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