Seagate Mobile HDD Product Manual, Rev. A
39
Serial ATA (SATA) Interface
6.3.2
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 17 Set Features command values
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
55
H
Disable read look-ahead (read cache) feature.
82
H
Disable write cache
AA
H
Enable read look-ahead (read cache) feature
(default).
C1
H
Disable the Free Fall Protection feature (41
H
above enables the Free Fall Protection feature)
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
