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

4-82 January 2005 81-81200-02 REV A01

4.9.5 Data Compression Page (0Fh)

The Data Compression Page specifies parameters for the control of data compression. This page

allows an initiator to turn the SDLT tape drive’s compressed format on and off independently of the

position of the tape medium.

Figure 4-48. Data Compression MODE SELECT Page — Data Format

Busy Timeout Period Specifies the maximum time, in 100 ms increments, that the initiator allows the

drive to remain busy for unanticipated conditions that are not a routine part of

commands from the initiator. A value of 0000h is undefined. A value of FFFFh

specifies an unlimited busy timeout period.

Extended Self-test

Completion Time

Contains advisory data that an application client uses to determine the time (in

seconds) that the drive requires to complete an extended self-test when the drive is

not interrupted by additional commands and no errors occur during execution of

the self-test. The application client should expect this time to increase

significantly if it sends other commands to the drive while a self-test is in progress

or if errors occur during execution of the self-test.

Bit

Byte

7 6 5 4 3 2 1 0

0 PS Rsv’d Page Code (0Fh)

1 Page Length (0Eh)

2 DCE DCC (1) Reserved

3 DDE (1) RED (0) Reserved

4 – 7

(MSB)

Compression Algorithm (10h)

(LSB)

8 – 11

(MSB)

Decompression Algorithm (10h)

(LSB)

12 – 15 Reserved

Table 4-49. Control Mode MODE SELECT Page — Field Descriptions (Continued)

Field Name Description

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 293 294

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