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Commands: Mode Sense (1Ah) Page 91

MODE SENSE Parameters

The parameter list for the MODE SENSE command contains

• A four-byte header, followed by

• Zero or one eight-byte Block Descriptor, followed by

• Zero or more variable-length pages.

The following table illustrates the structure of the Mode Sense command.

Byte

Bits

7 6 5 4 3 2 1 0

Parameter List Header

Block Descriptor

Mode Pages

The MODE SENSE response data consists of a four-byte header followed by an

eight-byte block descriptor. The following table shows the header format.

Byte

Bits

7 6 5 4 3 2 1 0

Mode Sense Data Length

Medium Type Field

WP BUF BUF BUF 0 0 0 0

Block Descriptor Length

Parameter List Header Field Descriptions

The following table defines the fields in the MODE SENSE Header.

Field

Name

Bytes

Bits

Description

Mode

Sense

Data

Length

0 This field specifies the number of bytes in the following Mode Sense

data that is available to be transferred If the Transfer Length is smaller

than the MODE SENSE Data Length, only Transfer Length bytes of the

MODE SENSE data are transferred. The Sense Data Length does not

include itself.

BUF 2 6-4 When this field is 1 the drive operates in buffered mode. In buffered

mode, a WRITE command is terminated when the data is transferred

to the internal buffer of the drive. When this field is 0 the drive is in

unbuffered mode and all data is written to tape before command

completion is returned. In non-buffered mode, a WRITE command is

not terminated until all data has been transferred to tape.

WP 2 7 If this bit is 1, the tape is write-protected. If this bit is 0, the tape is write-

enabled.

1 2 ... 98 99 100 101 102 103 104 105 106 107 108 ... 180 181

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