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MODE SENSE (6) / (10) Command (1Ah / 5Ah) SDLT 600 SCSI Interface Guide

4-120 January 2005 81-81200-02 REV A01

Data Compression Page (0Fh)

The Data Compression Page specifies parameters that control data compression.

Figure 4-67. Data Compression MODE SENSE Page — Data Format

Bit

Byte

7 6 5 4 3 2 1 0

0 PS (0) Rsv’d Page Code (0Fh)

1 Page Length (0Eh)

2 DCE DCC (1) Reserved

3 DDE (0) RED (0) Reserved

4 – 7

(MSB)

Compression Algorithm (10h)

(LSB)

8 – 11

(MSB)

Decompression Algorithm

(LSB)

12 – 15 Reserved

Table 4-68. Data Compression MODE SENSE Page — Field Descriptions

Field Name Description

PS Parameters Savable. Not supported. Always set to 0.

Page Code Identifies the type of MODE SENSE page being transferred. A value of

0Fh identifies this as the Data Compression page.

Page Length 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 the drive returns depends on the

current WRITE density of the drive.

When set to 0, indicates that write compression is disabled. When set to 1,

indicates that write compression is enabled.

DCC Data Compression Capable. The value the drive returns indicates whether

the drive supports data compression.

When set to 0, indicates that data compression is disabled. When set to 1,

indicates that data compression is enabled.

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