Fujitsu M2488 manual Erase command 19h, Erase CDB Description, Erase Field Description

M2488 PRODUCT GUIDE TAPE UNIT SCSI COMMANDS

4-3.5 ERASE command 19h

The ERASE command causes part or all of the remaining medium to be erased beginning from the current logical position.

After the receipt of a valid ERASE command, tape synchronization is performed prior to execution of the ERASE operation. If tape is positioned at BOT, the ERASE command will cause an ID area to be written before the Erase operation.

4-3.5.1 ERASE CDB Description

ERASE is a six-byte command as shown below and described in Table 4-14. Common fields are described in paragraph 4-3.1 on page 4-4.

						BITS
BYTES	7	6	5		4		3	2	1			0
0	0	0	0		1		1	0	0			1
1
		LUN					Reserved			Immed			Long
2						Reserved
3						Reserved
4						Reserved
5
				Reserved							Flag		Link

Note: Changeable fields in the CDB are shaded.

					Table 4-14. ERASE Field Description
BYTE	BIT		VALUE				DESCRIPTION
0	0-7			19h		Operation code.
1	0			0		If Long bit=0, Erase gap.
				1		If Long bit=1, Data security erase.
1	0-1					The Immediate (Immed) bit controls the time at which status is to be returned.
						Actions taken by the target depend on the settings of the Immed and Long bits as
						described in the next table.
	IMMED BIT			LONG BIT			ACTION TAKEN
		0		Don’t care			Status is returned after the Erase operation is complete.
		1		0			Status is returned after the CDB is validated. *
		1		1			Status is returned after all previously buffered commands are
							completed and the CDB is validated. *
	* If a CHECK CONDITION status is returned for this case, the ERASE operation is not performed.

April 1997 CG00000-011503 REV. A 4-15