10 set features (efh) – FUJITSU MCJ3230AP User Manual
Page 107
4.5 ATA Commands
C156-E205-01EN
4-35
4.5.10 SET FEATURES (EFh)
Table 4.31 SET FEATURES command
Bit
7
6
5
4
3
2
1
0
CM
1
1
1
0
1
1
1
1
DH
X
X
X
DEV
X
X
X
X
CH
X
X
X
X
X
X
X
X
CL
X
X
X
X
X
X
X
X
SN
X
X
X
X
X
X
X
X
SC
Setting value
FR
Setting value
The SET FEATURES command changes the ODD operating mode to the mode
set in the SC and FR registers. If the specified value is not supported by the ODD
or an invalid value, the ODD reports Aborted Command.
Table 4.32 FR register setting value
Setting
value
Function
Default
value
02
Enables the write cache.
*
03
Supports data transfer depending on the value of the SC register. See Table
4.33.
31
31
Disables the media status notification function.
*
55
Disables the read ahead cache.
66
Does not reset various setting values to the power-on default value by
software reset. (The media status notification function is reset normally.)
*
82
Disables the write cache.
95
Enables the media status notification function.
AA
Enables the read ahead cache.
*
CC
Returns various setting values to the power-on default value by software
reset.