reading tapes in bad conditions

From: CLASSICCMP_at_trailing-edge.com <(CLASSICCMP_at_trailing-edge.com)>
Date: Thu Dec 9 17:07:51 1999

>depending on the number of records skiped vmstpce returns parity error
>or EOT. There seems to be no correlation between number of records and error
>type.

Keep in mind that VMSTPCE, by default, does a rewind before doing
the image, so your SET MAG/SKIP commands probably don't mean anything
anyway. You need /NOREWIND to force it to not rewind.

VMSTPCE also has the "/ERROR" switch to make it ignore erros. I
suspect your tape drive thinks its too smart to read past an error though.

>I was thinking of strange suggestions like those to get stuck RD53 working
>again.

For 800 BPI, you can always move the start-of-tape marker past the
crinkled tape. This will work for *some*, but not all, 1600 BPI tape
drives too. (There's a ID burst at the start of a 1600 BPI tape that
some drives will insist on finding.) Same for 6250.

>Eric, I guess you'll have to wait untill I have set up again the 3420 tapes;
>these probably are old enough to not be too smart.

What's the project, out of curiosity? I've only got a dozen 9-track
drives here that might help :-)

-- 
 Tim Shoppa                        Email: shoppa_at_trailing-edge.com
 Trailing Edge Technology          WWW:   http://www.trailing-edge.com/
 7328 Bradley Blvd		   Voice: 301-767-5917
 Bethesda, MD, USA 20817           Fax:   301-767-5927
Received on Thu Dec 09 1999 - 17:07:51 GMT

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