Map To Logical request made with invalid physical drive.

     Occurs on:  SFT I, SFT II, TTS.  This is an Abend error.

     Meaning:    The routine called "Map to Logical" which translates a
                 physical drive number to a logical drive number was
                 called with an invalid physical drive number.  This
                 error is the result of a failed internal consistency
                 check and should never occur.

     Cause:      This error could be caused by a memory failure in the
                 file server and could be attributable to either a
                 hardware failure or poor power line conditioning.  A
                 corrupt operating system file might also cause this
                 error.

     Solution:   Reboot the file server.  If this error or other Abend
                 errors occur repeatedly, reinstall the operating system
                 and then check the file server's memory and power line
                 conditioning.