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From: bt455s10@uhccux.uhcc.hawaii.edu (Carl "Art" McIntosh)
Newsgroups: comp.sys.ncr
Subject: Re: Copying from one tape to another tape
Keywords: cpio, tar, dd
Message-ID: <6123@uhccux.uhcc.hawaii.edu>
Date: 11 Jan 90 18:31:11 GMT
References: <812@pmday_2.Dayton.NCR.COM> <1887@sauron.Columbia.NCR.COM>
Reply-To: bt455s10@uhccux.UUCP (Carl "Art" McIntosh)
Distribution: usa
Organization: University of Hawaii
Lines: 33

In article <1887@sauron.Columbia.NCR.COM> stevem@sauron.UUCP (Steve McClure) writes:
>In article <812@pmday_2.Dayton.NCR.COM> steve@pmday_2.Dayton.NCR.COM (Steve Bridges) writes:
>|A possible scenario follows:  I have a 150mb tape with some files somebody
>|with another tower wants.  They only have a 45mb tape drive, but I have
>|both a 150mb and a 45mb tape drive.  I want to copy what is on
>|the 150mb tape to a 45mb tape without putting a copy in disk.
>|
>|Thanks in advance for any responses.
>
>Steve, what about dd if=/dev/150Mtape of=/dev/45Mtape bs=100k    ???
>
>Steve McClure
>-----
>stevem@Columbia.NCR.COM
>The above are my opinions, which NCR doesn't really care about anyway!
>CAUSER's Amiga BBS! | 803-796-3127 | 8pm-8am 8n1 | 300/1200/2400

I ran across a problem a couple of months back regarding reading 45MB
tapes in a 150MB drive.  Evidently the bytes are *swapped*, so you need
to use dd(1) to do the conversion.  The command below will read a 45MB
tape in a 150MB drive into the filesystem.

dd if=/dev/rstp/34yy conv=swab | cpio -idcmuv

You may have to mess with the -c option to cpio depending if the tape
was created using it or not.  Possibly you need to swap bytes as well
prior to writing to your 45MB tape.

--
Art Neilson 
Bank of Hawaii Tech Support
ARPA: manapua!pilikia!root@trout.nosc.mil
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