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Read Multiple (C4H) - Hitachi T7K250 - Deskstar - Hard Drive Specifications

3.5 inch ultra ata/133 hard disk drive, 3.5 inch serial ata hard disk drive
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12.20 Read Multiple (C4h)

Table 97: 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
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.
Output parameters to the device
Sector Count
Sector Number
Cylinder High/Low
H
Input parameters from the device
Sector Count
Sector Number
Cylinder High/Low
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
IDN
0
ABT T0N AMN
V
0
V
0
This indicates the number of continuous sectors to be transferred. The Sector Count must
be set to one.
This indicates the sector number of the sector to be transferred. (L = 0)
In LBA mode, this register contains LBA bits 0–7. (L = 1)
This indicates the cylinder number of the sector to be transferred. (L = 0)
In LBA mode, this register contains LBA bits 8–15 (Low), 16–23 (High). (L = 1)
This indicates the head number of the sector to be transferred. (L = 0)
In LBA mode, this register contains LBA bits 24–27. (L = 1)
This indicates the number of requested sectors not transferred. This number is zero unless
an unrecoverable error occurs.
This indicates the sector number of the transferred sector. (L = 0)
In LBA mode, this register contains current LBA bits 0–7. (L = 1)
This indicates the cylinder number of the transferred sector. (L = 0)
In LBA mode, this register contains current LBA bits 8–15 (Low), 16–23 (High). (L = 1)
Deskstar T7K250 Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
0
7
6
5
BSY RDY DF DSC DRQ
V
0
V
0
157
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
Status Register
4
3
2
1
COR IDX
V
-
0
-
0
ERR
V
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