Exabyte EXB-8505 8mm Resetting the Tape Drive, Effect of PREVENT/ALLOW Medium Removal Command

4Requirements for Use

Effect of PREVENT/ALLOW MEDIUM REMOVAL Command

If an initiator has issued a PREVENT MEDIUM REMOVAL (1Eh) command to prevent the removal of the data cartridge, the tape drive will not eject the data cartridge until the initiator sends an ALLOW MEDIUM REMOVAL (1Eh) command to allow you to remove the data cartridge.

For more information about using the PREVENT/ALLOW MEDIUM REMOVAL command, see the EXB-8205 and EXB-8505 SCSI Reference.

Error During Unload Procedure

If an error exists before or during the unload procedure, the tape drive suspends the preceding sequence of events and the top amber LED will flash. If you press the unload button again, the tape drive reattempts the unload sequence; however, the tape drive does not write data in the buffer to tape. The tape drive clears the buffer and errors.

Resetting the Tape Drive

You can reset the tape drive by any of the following methods:

Powering the tape drive off and back on again (power-on reset).

Sending an RST pulse on the SCSI bus for a minimum of 25 μsec (SCSI bus or “hard” reset). A SCSI bus reset immediately clears all devices from the bus and resets their associated equipment.

Issuing a Bus Device Reset (0Ch) message to the tape drive (device or message reset). A device reset clears the tape drive from the bus and causes all commands to be cleared.

Pressing the unload button to clear a servo error.

Note: If a SCSI bus or device reset occurs during a power-on reset, the tape drive will perform a full power-on reset.

If the tape drive has a data cartridge inserted or loaded when a reset condition occurs, it rewinds the tape and positions to LBOT after the reset operation is complete. The total time required for the reset may be as long as three minutes if the tape is positioned near the end of tape.

4-16	EXB-8205 and EXB-8505	510504
	(Standard and XL)