HP3000-L Archives

June 2006, Week 1

HP3000-L@RAVEN.UTC.EDU
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Subject:
Re: Converting A 7980S to a 7980A for a Classic
From:
"Johnson, Tracy" <[log in to unmask]>
Reply To:
Johnson, Tracy
Date:
Fri, 2 Jun 2006 14:58:36 -0400
Content-Type:
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Jeff Kell says:
> And the 7970B had *no* read-after-write verification.  Your 
> data was written on a wing and a prayer.  The 7970E and it's 
> successors had a separate read head that would sanity-check 
> your write operations.

I'm reminded once an Engineer told me a 1600bpi "only" drive could
theoretically read 800bpi written tapes.  The procedure was to force the
machine to only read every other bit.  All one had to do was discard the
checksum at the end.

Tracy Johnson
Measurement Specialties, Inc. 

BT







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