This information applies to the TL81n, TL82n, and TL89n
  classes of libraries.

  With TL8nn tape libraries, the drives and robot units are
  separate. There are three parts to the naming convention
  for a TL8nn tape library:

  ·    The name begins with a prefix of MK for the tape
  device and GK for the robotic device.

  ·    The prefix is followed by a letter indicating the
  physical SCSI bus to which the device is connected to the
  host system. For devices connected to the first bus
  detected at boot time, the letter is A, for the second
  bus detected, B, and so on.

  ·    The next part is a number corresponding to the SCSI
  target ID.

  For example, with a TL810 library system with the robotic
  unit connected to the second bus detected at boot time at
  target ID 5, the name would be GKB500. When installing a
  TL8nn Automated Tape Library system, you need to keep
  track of the device names for the drives serviced by the
  particular robotic transport device.  MRU software cannot
  unload a cartridge from a drive in a TL8nn Automated Tape
  Library system without first dismounting the cartridge.
  MRU software has no way of associating the drives with
  the robotic transport device.  You must supply the device
  file name before unloading a cartridge.