Quantum DLTtape DLT1, Interface Manual

Page: 114 / 182

Chapter 4: SCSI Commands
4-72 July 2004 81-81276-01 Rev A01
Table 4-41. MODE SENSE (6/10) Block Descriptor — Field Descriptions
Field Name Description
Density Code This field matches the current density of the media, or 0 if the density is unknown.
Density Code Description
00h Use default density
1Ah DLT 4000 format, 20 GB (READ-ONLY)
40h DLT1 format, DLTtape IV – 40 GB
82h DLT 4000 format, 20 GB without compression
(READ-ONLY)
83h DLT 4000 format, 40 GB with compression (READ-
ONLY)
86h DLT1 format, DLTtape IV – 40 GB without
compression
87h DLT1 format, DLTtape IV – 80 GB with compression
Number of Blocks This field is sent as 0, indicating that all of the remaining logical blocks on the
medium have the medium characteristics specified by the block descriptor.
Block Length This specifies the length, in bytes, of each logical block transferred over the SCSI
bus. A block length of 0 indicates that the length is variable (as specified in the I/O
command). Any other value indicates the number of bytes per block used for
READ, WRITE, and VERIFY type commands that specify a “Fixed” bit of 1
(Fixed Block Mode).