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SCSI Commands
READ BLOCK LIMITS
Command Descriptor Block
Field Descriptions
Block Limit Data
The Read Block Limits command requests that the drive return the maximum and
minimum block sizes that it supports. The minimum block length is always reported
as 1 byte, the maximum as 2
Bits
Byte
7
6
0
1
Ignored LUN
2
3
4
5
Field
Bytes
Bits
Operation
0
Code
Ignored
1
5-7
Logical
Unit
Reserved
Control
5
The host specifies the actual block size in fixed mode with the Mode Select
command and in variable mode with the transfer/allocation length of Read and Write
commands. The use of the Mode Sense command determines the current block
size. The Read Block Limits command indicates the minimum and maximum block
size that the drive can support.
The Read Block Limits command returns data in the following format.
Bits
Byte
7
6
0
1
2
3
4
5
24
-1 bytes.
5
4
3
Operation Code (05h)
Reserved
Reserved
Reserved
Reserved
Control
Description
The Operation Code for Read Block Limits is 05h
The LUN field is residual from the SCSI-1 days and is ignored.
All reserved bits must be 0.
See Control Byte Format on page 18.
5
4
3
Reserved
Maximum Block Length, MSB
Maximum Block Length
Maximum Block Length, LSB
Minimum Block Length, MSB
Minimum Block Length, LSB
Page 79
2
1
0
2
1
0
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