Quantum DLT 4000 Manual descargar pdf (Pagina 208)

SCSI Commands

5-108 Quantum DLT 4000 Tape Drive

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

Table 5–52 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:

0 = Write compression is Disabled

1 = Write compression is Enabled

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

whether this tape drive supports data compression:

0 = Data Compression is not supported

1 = Data Compression is supported and will process any data sent to it by

the initiator according to the setting of the DCE bit (byte 02, bit 7).

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

whether data decompression is enabled or not.

0 = Data Decompression is Disabled

1 = Data Decompression is 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 4000 Manual Pagina 208