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September 1999, Week 4

HP3000-L@RAVEN.UTC.EDU

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Subject:
From:
Lars Appel <[log in to unmask]>
Reply To:
Lars Appel <[log in to unmask]>
Date:
Sat, 25 Sep 1999 17:55:05 +0200
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Richard,

>That is, "store to disk" *really* is "store" (tape) on "disk".  What was
>on the tape, put on disk, and you have "store to disk" format. It's not
>some new, special "format", it's just the store tape file on disk!  Why is
>this special?  Because it's so simple and it actually works.

Well, I guess, the internal format of a Store-to-Disk file is not exactly
like the data on the STORE tape or DDS or DLT. I never looked at it like
Keven obviously had to. My initial TapeCopy version used a "proprietary"
format for the disc file. It is/was documented in the (then) Pascal source
code. Keven switched to the Store-to-Disk format (and C source code ;-)

Why can't the disc file match the tape format exactly? Simple reason comes
to mind... A tape can have groups of records (of varying length) separated
by tape marks (EOF markers), but a disc file does not have (multiple) EOFs.

Lars.

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