Ref: 10860006
Title: Internal Error 4 during Backup/Restore
Date: 7/28/88

Copyright 3Com Corporation, 1991.  All rights reserved.

"INTERNAL ERROR 4" occurs during the very beginning of a
backup/restore tape (which may be at the beginning of tape 1, or at
the tape  change point).  It occurs when an unexplained error occurs
when trying to read the very first tape block (which should either
contain a valid 3+ ib block, be blank, or be some other thing).
Possibility that the user popped the tape out by hand.
