Seagate Desktop HDD Product Manual - Page 33

Set Features command, Table 12

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www.seagate.com SATA Interface 4.3.2 Set Features command This command controls the implementation of various features that the drive supports. When the drive receives this command, it sets BSY, checks the contents of the Features register, clears BSY and generates an interrupt. If the value in the register does not represent a feature that the drive supports, the command is aborted. Power-on default has the read look-ahead and write caching features enabled. The acceptable values for the Features register are defined as follows: Table 12 Set Features command 02H Enable write cache (default). 03H Set transfer mode (based on value in Sector Count register). Sector Count register values: 10H 55H 82H 90H AAH F1H 00H Set PIO mode to default (PIO mode 2). 01H Set PIO mode to default and disable IORDY (PIO mode 2). 08H PIO mode 0 09H PIO mode 1 0AH PIO mode 2 0BH PIO mode 3 0CH PIO mode 4 (default) 20H Multiword DMA mode 0 21H Multiword DMA mode 1 22H Multiword DMA mode 2 40H Ultra DMA mode 0 41H Ultra DMA mode 1 42H Ultra DMA mode 2 43H Ultra DMA mode 3 44H Ultra DMA mode 4 45H Ultra DMA mode 5 46H Ultra DMA mode 6 Enable use of SATA features Disable read look-ahead (read cache) feature. Disable write cache Disable use of SATA features Enable read look-ahead (read cache) feature (default). Report full capacity available Note At power-on, or after a hardware or software reset, the default values of the features are as indicated above. Seagate Desktop HDD Product Manual, Rev. J 29

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Seagate Desktop HDD Product Manual, Rev. J
29
www.seagate.com
SATA Interface
4.3.2
Set Features command
This command controls the implementation of various features that the drive supports. When the drive receives this
command, it sets BSY, checks the contents of the Features register, clears BSY and generates an interrupt. If the
value in the register does not represent a feature that the drive supports, the command is aborted. Power-on
default has the read look-ahead and write caching features enabled. The acceptable values for the Features
register are defined as follows:
Table 12
Set Features command
02
H
Enable write cache
(default).
03
H
Set transfer mode (based on value in Sector Count register).
Sector Count register values:
00
H
Set PIO mode to default (PIO mode 2).
01
H
Set PIO mode to default and disable IORDY (PIO mode 2).
08
H
PIO mode 0
09
H
PIO mode 1
0A
H
PIO mode 2
0B
H
PIO mode 3
0C
H
PIO mode 4
(default)
20
H
Multiword DMA mode 0
21
H
Multiword DMA mode 1
22
H
Multiword DMA mode 2
40
H
Ultra DMA mode 0
41
H
Ultra DMA mode 1
42
H
Ultra DMA mode 2
43
H
Ultra DMA mode 3
44
H
Ultra DMA mode 4
45
H
Ultra DMA mode 5
46
H
Ultra DMA mode 6
10
H
Enable use of SATA features
55
H
Disable read look-ahead (read cache) feature.
82
H
Disable write cache
90
H
Disable use of SATA features
AA
H
Enable read look-ahead (read cache) feature
(default).
F1
H
Report full capacity available
Note
At power-on, or after a hardware or software reset, the default values of the features are as indicated above.