SCSI Commands

5.3ERASE COMMAND (19h)

The ERASE command causes data on the tape medium to be erased. Any WRITE data currently held in buffer memory and not yet written to tape is written to tape before the ERASE command is executed. ERASE command must be issued while at BOT.

Note that the time for a complete erase of a DLTtape IV tape cartridge can be well over one hour.

Bit

7

 

6

 

5

4

 

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

Operation Code (19h)

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

Logical Unit Number

 

 

 

Reserved

 

Immed

Long (1)

 

 

 

 

 

 

 

 

 

 

 

2 - 4

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

5

 

Unused

 

 

 

Reserved

 

Flag

Link

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5–3 ERASE Command Descriptor Block - Data Format

Table 5–6 ERASE Command Descriptor Block - Field Descriptions

 

Field

Description

 

 

 

 

 

Immed

Immediate. If the Immediate bit = 0, the target does not return status until the

 

 

selected operation has completed.

 

 

If set to 1, status is returned as soon as the operation has been initiated.

 

Long

Must be set to 1. The Long bit controls the distance of tape to be erased. Filler

 

 

and End of Data (EOD) blocks are written if needed, then the entire rest of the

 

 

tape is erased.

 

 

NOTE: The ERASE command results in no operation for the tape drive unless

 

 

the Long bit is set to 1. Issuing the ERASE command away from Beginning of

 

 

Tape (BOT) is an ILLEGAL REQUEST.

 

 

 

 

 

 

 

 

5-14

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Erase Command 19h
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DLT 7000 specifications

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