Quantum DLT 8000 Manual descarregar pdf (Página 267)

SCSI Commands

Quantum DLT 8000 Tape System 5-123

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

Table 5–56 Data Compression Page — Field Descriptions

Field Name Description

PS Parameters Savable. Not supported; must be 0.

Page Length The value in this field indicates the number of bytes in the Control

Mode Page being transferred. The value for this byte is 0Eh.

DCE Data Compression Enable. The value returned for this bit depends on

the current WRITE density of the tape drive:

Value Write Compression is…..

0 Disabled

1 Enabled

DCC Data Compression Capable. The value returned for this bit indicates

whether this tape drive supports data compression

Value Data Compression is…..

0 Disabled

1 Enabled

DDE Data Decompression Enable. The value returned for this bit indicates

whether data decompression is enabled or not.

Value Data Decompression is…..

0 Disabled

1 Enabled

Note that when the tape drive reads compressed data from tape, it

automatically decompresses the data before sending it to the

initiator. The value for this bit, therefore, is always 1.

RED Report Exception on Decompression. The tape drive does not report

exceptions on decompression (boundaries between compressed and

decompressed data). The value returned for RED is 00h.

Compression Algorithm The value for this field is 10h. This indicates the Lempel-Ziv high

efficiency data compression algorithm.

Decompression Algorithm The value for this field is 10h. This indicates the Lempel-Ziv high

efficiency data decompression algorithm. If EEPROM parameter

EnaRepDCcomp is set, a value of 0 is reported if the last block read is

not decompressed.

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Quantum DLT 8000 Manual Página 267