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SCSI-2 Drive Command Set

Erase (Group 5) Command (ACH)

Chapter 2 2-135

SCSI-2 Drive Commands

NOTE The 9.1 and 5.2 Gbyte capacity drives cannot Format, Erase, Write, or

Write and Verify 650 Mbyte and 1.3-Gbyte optical disks. The 2.6 Gbyte

capacity drives cannot Format, Erase, Write, or Write and Verify 650

Mbyte optical disks. If this command is issued with any of these drive/

media combinations, a CHECK CONDITION status will result with the

Sense Key/Additional Sense Code set to Data Protect/Write Protected.

NOTE If this command is executed for write-once disks, the drive returns a

CHECK CONDITION status with the Sense Key/Additional Sense Code

set to Illegal Request/Invalid Command Operation Code.

ERA An Erase All bit of 1 indicates that all remaining blocks

are erased, starting from the logical block address to the

end of the disk. The transfer length must be set to 0.

An ERA bit of 0 indicates that all blocks are erased,

starting from the logical block address to the end of the

specified transfer length.

Rel Adr A relative address bit of one indicates that logical block

address specified is a two’s complement offset from the

last logical block address accessed.

A value of 0 indicates that the logical block address is an

absolute address.

Transfer

Length The Transfer Length field specifies the number of

contiguous logical blocks of data to be erased for this

command. A value of 0 indicates that no blocks will be

erased and is not considered an error.

PBA A Physical Block Address bit of 1 indicates that physical

block addressing is used.

A PBA bit of 0 indicates that logical block addressing is

used.

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