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36 CONSTELLATION ES.3 SERIAL ATA PRODUCT MANUAL, REV. A
6.3.1 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 34. 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 5 for default parameter
settings.
The following commands contain drive-specific features that may not be included in the Serial ATA specification.
Write Multiple C5
H
Write Multiple Extended 39
H
Write Multiple FUA Extended CE
H
Write Sectors 30
H
Write Sectors Without Retries 31
H
Write Sectors Extended 34
H
Write Uncorrectable 45
H
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
COMMAND NAME COMMAND CODE (IN HEX)