Read Multiple (C4H); Table 112.Read Multiple (C4H) - Hitachi 7K80 - Deskstar - Hard Drive Specifications

12.19 Read Multiple (C4h)

Table 113: Read Multiple (C4h)
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 IDN
0 V 0
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. The command execution is identical to the
Read Sectors command with one exception: an interrupt is generated for each block—as defined by the Set Multi-
ple command—instead of for each sector.
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
1 L 1 D H H H H
1 1 0 0 0 1 0 0
4 3 2 1 0
0 ABT T0N AMN
V 0 V 0 0
Deskstar 7K80 Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
7 6 5 4
BSY RDY DF DSC DRQ
0 V 0 V
163
7 6 5 4 3 2 1 0
- - - - - - - -
see below
V V V V V V V V
V V V V V V V V
V V V V V V V V
V V V V V V V V
- - - - H H H H
see below
3 2 1 0
COR IDX ERR
- 0 - V