This directive should be specified if

-  this device is used with an autochanger and you want to overwrite the default :config:option:`sd/autochanger/ChangerDevice`\  or

-  if you have a standard tape drive and want to use the :config:option:`sd/device/AlertCommand`\ .

The specified device must be a generic SCSI device.

For details, see the :ref:`AutochangersChapter` chapter.
