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SCSI Commands

Quantum DLT 4000 Tape Drive 5-71

MODE SELECT (6) / (10) Command (15h) / (55h) (continued)

Table 5–37 Error Recovery Page - Field Descriptions

Field Name Description

PS Parameters Savable. For MODE SELECT, this bit must be 0.

Additional Page

Length

This field indicates the number bytes in the page. However, the value does

not include bytes 0 and 1. The length is returned in MODE SENSE

commands and must subsequently be set to the same value when

performing MODE SELECT. If the page length does not match that

expected by the drive, a CHECK CONDITION status is returned, sense key set

to ILLEGAL REQUEST.

The drive returns a CHECK CONDITION status with sense key set to ILLEGAL

REQUEST if it receives an unsupported Page Code or a Page field with

values not supported or changeable. In such cases, no parameters are

changed as a result of the command.

TB Transfer Block. Not supported.

EER Enable Early Recovery. Set to 1 (always enabled).

PER Post Error. Default is 0. If set to 1, this bit enables reporting of CHECK

CONDITION to report recovered READ / WRITE errors.

DTE Disable Transfer on Error. Must be 0. Not supported.

DCR Disable ECC Correction. Must be 0. Not supported.

Read Retry Count This field reports the maximum number or rereads that are attempted

before declaring an unrecoverable error.

Write Retry Count This field reports the maximum number of overwrite retries that will be

attempted before declaring an unrecoverable error.

5.9.3 Disconnect / Reconnect Page (02h)

The Disconnect / Reconnect Page controls the drive’s behavior on the SCSI bus

and allows an initiator to tune bus performance.

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Quantum DLT 4000 Handbuch Seite 171