Set Multiple (C6H); Figure 114. Set Multiple Command (C6H) - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

13.31 Set Multiple (C6h)

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 114. Set Multiple command (C6h)

The Set Multiple command enables the device to perform Read and Write Multiple commands and
establishes the block size for these commands. The block size is the number of sectors to be transferred
for each interrupt.
The default block size after power up or hard reset is 0. The Read Multiple and Write Multiple commands
are disabled.
If an invalid block size is specified, an Abort error will be returned to the host. The Read Multiple and Write
Multiple commands will be disabled.
Output Parameters To The Device
Sector Count.
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
V V V V V V V V
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
1 1 0 0 0 1 1 0
4 3 2 1
IDN 0 ABT T0N AMN
0 0 V 0
This indicates the block size to be used for the Read Multiple and the Write
Multiple commands. Valid block sizes can be selected from 0, 2, 4, 8 or 16. If 0 is
specified, then the Read Multiple and the Write Multiple commands are disabled.
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
167
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
4 3 2 1 0
DSC DRQ COR IDX ERR
- - 0 - V