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12.23 Read Multiple (C4h)
The Read Multiple command reads one or more sectors of data from disk media, and then transfers the data from
the device to the host.
The sectors are transferred through the Data Register 16 bits at a time. Command execution is identical to the Read
Sector(s) command except that an interrupt is generated for each block (as defined by the Set Multiple command)
instead of for each sector.
Table 169 Read Multiple Commands (C4h)
Command Input
Field
Description
FEATURE
N/A
COUNT
The number of logical sectors to be transferred. A value of 00h
indicates that 256 logical sectors are to be transferred
LBA
LBA of first logical sector to be transferred
DEVICE
Bit Description
7:5 Obsolete
4 Transport Dependent
3:0 Reserved
Command
7:0 C4h
Normal Outputs
See Normal Outputs in Section 12.7 Flush Cache (E7h)
Error Outputs
See Error Outputs in Section 12.18 Read DMA (C8h/C9h)
235
Hard Disk Drive Specification