13.3 Enable/Disable Delayed Write (FAh: vendor specific)
Command Block Output Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Error Register
7
6
5
CRC
UNC
0
0
0
0
Figure 80. Enable/Disable Delayed Write command (FAh)
The Enable/Disable Delayed Write command sets if the Delayed Write function is enabled or disabled.
Delayed Write function is enabled or disabled according to the feature register's value.
Even if the Delayed Write function is enabled by this command, Delayed Write does not work when the
Write Cache function is disabled.
For details for this function refer to section 11.14, "Delayed Write Function (Vendor Specific)" on page 98.
Output parameters to the device
Feature
7 6 5 4 3 2 1 0
- - - - - - - -
V V V V V V V V
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
1 1 1 1 1 0 1 0
4
3
2
1
IDN
0
ABT
T0N
AMN
0
0
V
0
This is the destination code for this command.
07H is the Enable Delayed Write function
87H is the Disable Delayed Write function
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
0
7
6
5
BSY
RDY
DF
0
0
0
0
116
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
4
3
2
1
0
DSC
DRQ
COR
IDX
ERR
-
-
0
-
V