Seagate ST610712DEG ユーザーズマニュアル
ST1.3 Series Product Manual, Rev. C
31
4.1.3
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 inter-
rupt. 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:
this command, it sets BSY, checks the contents of the Features register, clears BSY and generates an inter-
rupt. 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 10:
Features register values
Feature
Description
02
H
Enable Write Cache.
03
H
Used for Set transfer mode Command.
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
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
05
H
Enable advanced power management
55
H
Disable read look-ahead (read cache) feature.
66
H
Disable Power On Reset (POR) establishment of defaults at Soft Reset.
82
H
Disable write cache.
85
H
Disable Advanced Power Management
AA
H
Enable read look-ahead (read cache) feature.
CC
H
Enable Power On Reset (POR) establishment of defaults at soft reset