Recently the topic came up about managing device drivers under Windows.
An excellent reference that too many users don't know about is the
"IBM SCSI Tape Drive, Medium Changer, and Library Device Drivers" reference.
It addresses Magstar tape drives and libraries for a variety of platforms.
The Windows section has fine screen-shot examples.
This manual set has come along way from its origins as a basic, text-only
publication out of the hardware area, and is now a nice 2-manual set,
available in both PostScript and PDF forms.  (Note that there is a defect in
the formatting of at least the PostScript version, where the left margins of
the front-facing pages are near the edge of the sheet, where they are obscured
when bound.  I am contacting Publications to get this corrected.)

Also therein you will find documentation of the 'tapeutil' and 'mtlib'
commands, plus other aids and insights.

How to obtain:

  "IBM SCSI Tape Drive, Medium Changer, and Library Device Drivers" manuals:
     (Installation and User's Guide  GC35-0154
      Programming Reference  WB2107)
        FTP to ftp.storsys.ibm.com, in /devdrvr directory, capture:
         IBM_scsi_tape_IUG.ps      and/or  IBM_scsi_tape_IUG.pdf
         IBM_scsi_tape_PROGREF.ps  and/or  IBM_scsi_tape_PROGREF.pdf

If you have Magstar tape drives or libraries, this is a must-have.

   Richard Sims, BU