exabyte woes

[Steve Elliott]

I've just had a very strange error message while trying to restore a file
from 8mm tape.  The error was: unknown file mode: 00

I used the dump command to create the tape; I was doing an interactive
restore when the error occurred?  Does anyone know what causes this error?
Is there any way to get around it?

Thanks in advance for any assistance.
Steve Elliott
se at uk.ac.lancs.comp