Enable/Disable Delayed Write (Fah: Vendor Specific); Figure 80. Enable/Disable Delayed Write Command (Fah) - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

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 11.13, "Delayed Write function (vendor specific)" on
page 100.
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
Travelstar 48GH, 30GN & 15GN 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
118
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
4 3 2 1 0
DSC DRQ COR IDX ERR
- - 0 - V