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12.52 Set Multiple Mode (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.
If an invalid block size is specified, an Abort error will be returned to the host, and Read Multiple and Write Multiple
commands will be disabled.
Count indicates the block size to be used for Read Multiple and Write Multiple commands. Valid block sizes can be
selected from 0, 1, 2, 4, 8 or 16. If 0 is specified, then Read Multiple and Write Multiple commands are disabled
Table 220 Set Multiple Mode Commands (C6h)
Command Input
Field
Description
FEATURE
N/A
COUNT
DRQ data block count
LBA
N/A
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
Command
7:0 C6h
Normal Outputs
See Normal Outputs in Section 12.7 Flush Cache (E7h)
Error Outputs
See Error Outputs in Section 12.12 Idle (E3h / 97h)
299
Hard Disk Drive Specification