Quantum DLT 8000 Manual descarregar pdf (Página 254)

SCSI Commands

5-110 Quantum DLT 8000 Tape System

MODE SENSE (6) / (10) Command (1Ah / 5Ah) (continued)

Table 5–50 MODE SENSE Data Header — Field Descriptions

Field Name Description

Mode Sense Data Length This field specifies the length (in bytes) of the MODE SENSE data that

follows that is available to be transferred during the DATA IN phase.

Note that the Mode Sense Data Length does not include itself.

Media Type The media type is determined by the drive and can be one of the

following:

Media Type Description

00h Unknown or not present

81h Cleaning tape

83h DLTtape III

84h DLTtape IIIXT

85h DLTtape IV

WP Write Protect. If 0, this field indicates that the tape is write-enabled. If

set to 1, it indicates that the tape is write-protected.

Buffered Mode This implements Immediate Reporting on WRITE commands via the

Buffered Mode.

If the field is 0, then the drive does not report a GOOD status on

WRITE commands until the data blocks are actually written to tape.

If the field is 1, then the drive reports GOOD status on WRITE

commands as soon as the data block has been transferred to the

buffer. This is the default configuration of the drive. Note that if

Buffered Mode is not used, the tape drive will suffer a degradation in

performance, but not in capacity.

Speed The default setting = 0. Tape system will attempt to match the drive’s

throughput with the host data throughput. Other available settings are:

1 = Bus Speed Below 5.0 MB/sec

2 = Bus Speed 5.0 – 6.0 MB/sec

3 = Bus Speed of 6.0 MB/sec or more

NOTE: This applies to DLT 8000 format only.

Block Descriptor Length This field specifies the length (in bytes) of all of the block descriptors.

Since the drive only supports one block descriptor, this value is 08h.

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Quantum DLT 8000 Manual Página 254