Seagate SV35 SV35.3 Series SATA Product Manual - Page 39

Identify Device command

Page 39 highlights

4.3.1 Identify 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 7 on page 30. 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 Configuration information: • Bit 15: 0 = ATA; 1 = ATAPI 0 • Bit 7: removable media • Bit 6: removable controller • Bit 0: reserved 0C5AH 1 Number of logical cylinders 16,383 2 ATA-reserved 3 Number of logical heads 0000H 16 4 Retired 5 Retired 6 Number of logical sectors per logical track: 63 7-9 Retired 10-19 20 Serial number: (20 ASCII characters, 0000H = none) Retired 21 Retired 22 Obsolete 23-26 Firmware revision (8 ASCII character string, padded with blanks to end of string) 0000H 0000H 003FH 0000H ASCII 0000H 0400H 0000H 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 8010H 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 0000H 2F00H 0000H 0200H 0200H SV35.3 Series Serial ATA Product Manual, Rev. B 33

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SV35.3 Series Serial ATA Product Manual, Rev. B
33
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 7 on
page 30. 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