Reference Guide

Chapter 4 SCSI Commands
MODE SELECT (6) / (10) Command (15h / 55h)
DLT-S4 Interface Reference Guide 103
Table 64 MODE SELECT
Mode Parameter Header —
Field Descriptions
Field Description
Medium Type The drive ignores this field.
Buffered Mode Set to 1 by default. The drive implements immediate reporting on
WRITE commands
through its buffered mode. With Buffered Mode set to 1, the drive reports
GOOD status
on
WRITE commands as soon as the data block has been transferred to the buffer. If
this field is set to 0, the drive does not report
GOOD status on WRITE commands until it
writes the data blocks to tape.
When Buffered Mode is not used, the drive suffers significant performance and
capacity degradation.
Speed The drive supports a single speed of operation per format. This field must be set to 0h.
Block
Descriptor
Length
Specifies the length in bytes of all the block descriptors. Since the drive only allows one
block descriptor, the value must be either 0 or 8. A value of 0 indicates no block
descriptor is included; a value of 8 indicates a block descriptor is present and precedes
the mode page data.