SCSI Commands: 35BREPORT DENSITY SUPPORT
Page
154
3.23
REPORT DENSITY SUPPORT
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 bit 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.
3.23.1
REPORT DENSITY SUPPORT Command Descriptor Block
Byte
Bits
7 6 5 4 3 2 1 0
0
Operation Code (44h)
1
Ignored LUN
Reserved
Media
2
Reserved
3
Reserved
4
Reserved
5
Reserved
6
Reserved
7
(MSB)
8
Allocation Length
(LSB)
9
Control
3.23.1.1
REPORT DENSITY SUPPORT Command Field Descriptions
Field Bytes
Bits
Description
Operation
Code
0
The Operation code for Report Density is 44h.
Ignored
Logical
Unit
1
5-7
The LUN field is vestigial from the SCSI-1 standard and is ignored.
Media
1
0
0 = Report all densities supported by drive.
1 = Report current media density.
Allocation
Length
7-8
Specifies the amount of data to be returned, in bytes.
Reserved
All reserved bits must be 0.
Control 9
See
SCSI Command Control Byte Format on page 25.
3.23.2
REPORT DENSITY SUPPORT Data
The REPORT DENSITY SUPPORT returns a header followed by one or more
pages of data.
3.23.2.1
REPORT DENSITY SUPPORT Header
Byte
Bits
7 6 5 4 3 2 1 0
0
(MSB)
1
Available Density Descriptor Length
(LSB)
2
Reserved
Summary of Contents for LTO 4
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