Data recovery from corrupted tapes

I am trying to recover tar archives from from some old TR-3
backup tapes encoded using the zftape compression.  I issue
a command like this:

	tar xvf /dev/zftape

It starts extracting files and printing their names to the
screen, but eventually it stops printing filenames and seems
to be stuck in an endless loop of rewinding and re-reading
the same section of tape, apparently because of a "bad sector".

I left it running in this cycle for about 20 minutes, but
it never got any further.  What I need is some way to skip
past the corrupted data and resume reading whatever can be
recovered.  I guess ideally I should extract the data to
a file, and worry about repairing the damaged tar archive
later.

Are there any settings for this?  Does anyone have experience
with damaged tapes?

Thanks,
-Pete

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