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SCSI Commands
REPORT DENSITY SUPPORT
Command Descriptor Block
Field Descriptions
Report Density Support Data
Report Density Support Header
The Report Density Support command returns details about the tape formats
supported by the drive. The data is returned as a header and a series of descriptor
blocks. If the Media flag is set, then one descriptor block is returned with the data for
the currently loaded tape. If the Media bit is clear, then one descriptor block is
returned for each format supported by the drive.
Bits
Byte
7
6
0
1
Ignored LUN
2
3
4
5
6
7
8
9
Field
Bytes
Bits
Operation
0
Code
Ignored
1
5-7
Logical
Unit
Media
1
0
Allocation
7-8
Length
Reserved
Control
9
The Report Density Support returns a header followed by one or more pages of data.
Bits
Byte
7
6
0
1
2
3
5
4
3
Operation Code (44h)
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Allocation Length, MSB
Allocation Length, LSB
Control
Description
The Operation code for Report Density is 44h.
The LUN field is residual from the SCSI-1 days and is ignored.
0 = Report all densities supported by drive.
1 = Report current media density.
Specifies the amount of data to be returned, in bytes.
All reserved bits must be 0.
See Control Byte Format on page 18.
5
4
3
Available Density Descriptor Length, MSB
Available Density Descriptor Length, LSB
Reserved
Reserved
Page 93
2
1
0
Media
2
1
0
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