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From: dclaar@hpda.UUCP (Doug Claar)
Newsgroups: net.micro.hp
Subject: Re: HP 3000 ASAVE Format
Message-ID: <1448@hpda.UUCP>
Date: Tue, 14-Oct-86 15:45:39 EDT
Article-I.D.: hpda.1448
Posted: Tue Oct 14 15:45:39 1986
Date-Received: Tue, 21-Oct-86 22:00:29 EDT
References: <457@cooper.UUCP>
Reply-To: dclaar@hpda.UUCP (Doug Claar)
Distribution: net
Organization: Hewlett-Packard Co., Cupertino, CA
Lines: 39
Summary: HP 3000 store/restore format

Most hp3000 tapes are in "store/restore" format. This format begins with 
2 EOF marks, and then a header label of 40 words, with the first 14 
words the string "STORE/RESTORE LABEL-HP/3000." 

word 27 of this header (28 if you start counting at 1) is the tape block 
size in words (0 = 1024 words--for backwards compatibility, I think).

After this is an eof, than a tape directory with 12 word records:
   0-3  is file name
   4-7  is group name
   8-11 is account name 
These are blocked according to the tape block size given above.

Another eof mark, and then the first file. "The data is blocked
according to the block size...(the last record may be shorter, but
will always be a multiple of 256 words)."

another eof, then the second file....
.
.
.
the last file, and an EOF, and then the trailer label:
  word 21 <> 0 means: preceding EOF marks actual end of that file
  word 22 <> 0 means: this is the end of the tape

This is the gist of it. You can use ST to get the files off. I
don't know of any 1000 tools that automatically read 3000 store/restore
tapes, but then I just barely know the 1000, being in the 3000 lab (In 
a company this big, that shouldn't be strange, but it doesn't look good
when I say it in writing...)

Oh, of course, this doesn't represent official HP positions, and all
that...


Doug Claar
HP Information Techonology Group
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