Quantum 10K II - Manual (Page 179)

SCSI Description
5–112 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
MODE SENSE (10) COMMAND (5Ah) (continued)
Bit
Byte
7 6 5 4 3 2 1 0
0 Density Code
1 - 3
(MSB)
Number of Blocks
(LSB)
4 Reserved
5 - 7
(MSB)
Block Length
(LSB)
Figure 5–49 Mode Parameter Block Descriptor — Data Format
Table 5–51 Mode Parameter Header & Block Descriptor — Field Descriptions
Data Field Description
Mode Data Length Reserved. Must be 0.
Medium Type Ignored by the drive.
Device Specific Parameter Ignored by the drive.
Block Descriptor Length
The value = 0 if no Block Descrptor is supplied; the length is 8 if a block
descriptor is supplied.
Density Code Ignored by the drive.
Number of Blocks The value in this field specifies the number of logical blocks on the unit
that are affected by the current MODE SELECT command. When this field
= 0, the MODE SELECT parameters are put into effect for all logical
blocks on the unit. The maximum value allowed is the total number of
initiator-addressable logical blocks for the value specified in the Block
Length field. A value that is less than the maximum value will decrease
the number of initiator-accessible logical blocks to the amount specified.
Block Length The value in this field specifies the length, in bytes, of each logical block.