This information applies to TLZnx and TZ8nn classes of DLT
  and DAT loaders.

  DLT and DAT tape loaders treat their robotic devices and
  tape devices as logical units of the device target ID. The
  are four parts to the naming convention with this type of
  robotic loader:

  ·    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.

  ·    The last part is a two-digit number corresponding to
  the SCSI target ID logical unit number. Because tape
  drives in a DLT or DAT loader are always at logical unit
  0, the last two digits are 00. The last two digits for
  the robotic device are 01.

  MKA400 is the name of a tape device connected to the
  first SCSI bus seen at boot time, at target ID 4. GKA401
  is the name of the robotic device, and the name of the
  robotic unit corresponding to the tape device MKA400.