Mode select (10) command (55h) (continued) – Quantum 10K II User Manual
Page 167
SCSI Description
5–100
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
MODE SELECT (10) Command (55h) (continued)
Bit
Byte
7
6
5
4
3
2
1
0
0 - 3
(MSB)
Number of Blocks
(LSB)
4
Density Code
5 - 7
(MSB)
Block Length
(LSB)
Figure 5–41 Mode Parameter Block Descriptor — Data Format
Table 5–44 Mode Parameter Block Descriptor — Field Descriptions
Data Field
Description
Number of Blocks
The value in this field specifies the number of logical blocks on the disk
to which the density code and block length fields apply. A value of 0 in
this field indicates that all of the remaining logical blocks on the disk
have the medium characteristics specified.
Density Code
The Density Code field is unique for each device type. Direct access
devices value is zero.
Block Length
The value in this field specifies the length in bytes of each logical block
described by the block descriptor.