Set Features (Efh); Figure 112. Set Features Command (Efh) - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

13.29 Set Features (EFh)

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 112. Set Features command (EFh)

The Set Feature command establishes the following parameters which affect the execution of certain
features as shown in the table below.
ABT will be set to 1 in the Error Register if the Feature register contains any undefined values.
After the power on reset or hard reset the device is set to the following features as default.
Write cache
ECC bytes
Read look-ahead
Reverting to power on defaults
Address Offset mode
7 6 5 4 3 2 1 0
- - - - - - - -
V V V V V V V V
Note 1.
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
1 1 1 0 1 1 1 1
4 3 2 1
IDN 0 ABT T0N AMN
0 0 V 0
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 V 0
: Enable
: 4 bytes
: Enable
: Disable
: Disable
163
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
4 3 2 1 0
DSC DRQ COR IDX ERR
- - 0 - V