Write Command 0Ah | Quantum Instruments DLT 7000 specification

SCSI Commands

5.25 WRITE COMMAND (0Ah)

The WRITE command transfers one or more blocks from the host to the current logical position. When in Buffered Mode (the DLT tape drive default mode), the tape drive reports GOOD status on WRITE commands as soon as this data block has been transferred to the data buffer. Any check conditions will be experienced as deferred errors. Refer to the MODE SELECT command subsection for more information on Buffered Mode.

Bit

Byte

Operation Code (0Ah)

Logical Unit Number

Reserved

Fixed

(MSB)

2 - 4

Transfer Length

(LSB)

Unused

Reserved

Flag

Link

Figure 5–81 WRITE Command Descriptor Block - Data Format

Table 5–82

WRITE Command Data - Field Descriptions

Field Name

Description

Fixed

The fixed bit specifies both the meaning of the Transfer Length field and whether

fixed-length or variable-length blocks are to be transferred.

When the Fixed bit is 0, Variable-length block mode is selected. A single block is transferred from the initiator and is written to the logical unit beginning at the current logical tape position. Upon successful termination, the tape is logically positioned after this block (on the EOM/P side). The Transfer Length specifies the number of bytes that the drive handshakes out from the initiator as one block.

5-168

Quantum DLT 7000 Tape System

DLT 7000 specifications

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Quantum Instruments DLT 7000 manual Write Command 0Ah

Models: DLT 7000