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MODE SELECT (6) / (10) Command (15h / 55h) SDLT 600 SCSI Interface Guide

4-72 January 2005 81-81200-02 REV A01

Table 4-44. MODE SELECT Mode Parameter Header — Field Descriptions

Field Name 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.

If Buffered Mode is set to a number greater than 1, t

he drive terminates the

command with CHECK CONDITION status,

Sense Key set to ILLEGAL

REQUEST, and Additional Sense Code set to INVALID FIELD IN CDB

Speed The drive supports a single speed of operation per format. This field must

be set to 0h. If set to any other value,

the drive terminates the command

with CHECK CONDITION status,

Sense Key set to ILLEGAL

REQUEST

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. If any value other

than 0 or 8,

the drive terminates the command with CHECK CONDITION

status,

Sense Key set to ILLEGAL REQUEST.

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Quantum 1200 Series DAT Autochanger Guide de l'utilisateur Page 114