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Page 98 DDS-4 SCSI Interface Manual, Rev. B

Device Configuration Page Field Descriptions

The following table describes the fields in the Device Configuration page.

Field Name Bytes Bits Description

Page Code 0 0-5 The Page Code field must be set to 10h to select this page.

Page Length 1 The Page Length field must be set to 14 (0Eh), which indicates that

14 parameter bytes follow the Page Length byte.

DIS RAW 2 4 The DIS RAW (Disable Read-After Write) bit enables and disables

the read-after write capability. If the value is 1, read-after-write

check and rewrites are disabled. If the value is 0, read-after-write is

enabled. The default value is 0.

EN C3 2 3 The EN C3 (Enable C3 bit enables and disables C3 ECC code

generation during writing. if the value is 1, C3 ECC code is

generated during writing; if the value is 0, c3 ECC code is not

generated. The default value is 1.

N-Group 2 0-2 The N-Group field specifies the number of repeats of each tape

group to record. Values greater than 0 can be used to increase

reliability. The default value is 0.

Active

Partition

3 The Active Partition field is set to the active partition—either 00h or

01h. The default is 0. The first partition on a dual partition tape is

partition 1.

Write Delay

Time

6-7 The Write Delay Time field indicates the maximum time, in

multiples of 100 milliseconds, which the drive waits with a partially

full buffer before recording the data to tape. The default value is

258h, indicating a 60-second delay.

BIS 8 6 Not supported, always 1

RSMK bit 8 5 The Report Setmarks (RSMK) bit determines whether or not the

drive recognizes setmarks.

If the value is 1, the drive recognizes and reports setmarks during

appropriate read and space operations. The default value is 1.

If the value is 0, the drive ignores setmarks. It skips setmarks as if

they do not exist.

REW bit 8 0 The Report Early Warning (REW) bit determines whether or not the

drive reports an early-warning condition for read operations. For

read-type operations, if this bit is 0, the drive does not report the

early-warning condition. The default setting is 0.

If this bit is 1, the drive reports the early-warning condition when

the logical early-warning position is encountered during read

operations. The drive reports early-warning at completion of READ

with no residual.

EEG 10 4 Not supported, always 1

SEW bit 10 3 If set to 1, the Synchronize at Early-Warning (SEW) bit causes the

drive to flush all buffered write data to tape when the early-warning

position is encountered.

If set to 0, this bit indicates that encountering the early-warning

position will cause the buffer to flush. The default setting is 0.

Select data

compression

algorithm

14 A value of 0 indicates the data is not to be compressed, a value of

1 indicates that the data is to be compressed using the default

compression algorithm. All other values are invalid

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 180 181

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Quantum DAT 24 Drive Guia do Utilizador Página 110

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