Dell PowerVault 120T DDS4 User Guide - Page 25

1) Sequential Mode Exchange the cartridge by using the UNLOAD command. 2) Random Mode Exchange the cartridge as you request by using MOVE MEDIUM command. Ejecting a Magazine in the Normal State The magazine can be ejected from the autoloader by the Eject button on the front panel or an UNLOAD command (LUN 1) from the host. The autoloader writes any buffered data to tape followed by an EOD prior to initiating the UNLOAD sequence. 1) The tape is rewound to BOT. 2) If the tape is write-enabled, a copy of the Tape log held in the RAM is written back on the tape. 3) The tape is then rewound to BOM and the tape is unthread from the mechanism. At this stage the tape is either retained in the drive or ejected, depending on whether media removal is enabled by the PREVENT ALLOW MEDIA REMOVAL command. 4) The loader unloads the cartridge back to the magazine. 5) The cartridges in the magazine are rotated and put back in order. 6) The magazine is ejected. NOTE: If the host has previously sent a PREVENT MEDIA REMOVAL command, the unloading action is different in two ways: • The Eject button is disabled and has no effect. It does not initiate an unload sequence. • An Unload command puts the drive into the semi-loaded state. That is, it takes the drive offline and unthreads the tape, but does not eject it. The effects of PREVENT MEDIA REMOVAL continue until an ALLOW MEDIA REMOVAL command is received, or the drive is reset. NOTES : The magazine may be ejected automatically for the following conditions. 1) When a magazine , having at least one of the slots(1~7) and slot 8 empty, has been inserted. 2) When a cartridge in the magazine has been inserted with incorrect orientation, or slide shutter is positioned incorrectly. 3) When an unexpected power shutdown/outage has occured that potentially may result in cartridge positioning disorder. 4) When the EEPROM on the the autoloader cannot be read. Dell PowerVault 120T DDS4 Autoloader User's Guide 3-11