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From: grog@lemis.de (Greg Lehey)
Organisation: LEMIS, Schellnhausen 2, 36325 Feldatal, Germany
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Subject: Re: TANDBERG TDC3600 - need multiple 512
To: tito@agi.es (TITO)
Date: Sun, 22 Sep 1996 11:57:45 +0200 (MET DST)
Cc: questions@freebsd.org
In-Reply-To: <199609201914.TAA01115@mail.agi.infase.es> from "TITO" at Sep 20, 96 07:11:28 pm
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TITO writes:
>
>
> I've a problem with make a tar backup to streamer TANDBERG.
>
>
> When I use the option z ( to make tar with gzip ), the system returns this
> bug.
>
> 	input/output error - must be multiple 512

Interesting one.  First, what it means: the driver wants a write
length which is a multiple of 512 bytes.  That works well enough with
tar normally, but not if you compress, in which case it writes in
dribs and drabs.  You can fix it with:

   tar czf - <files> | dd obs=20b of=/dev/rst0

This will force a block size of 20 blocks.

Greg