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Date:      Sun, 24 Dec 1995 19:25:14 +1100
From:      Bruce Evans <bde@zeta.org.au>
To:        bde@zeta.org.au, grog@lemis.de
Cc:        hackers@freebsd.org
Subject:   Re: disk to disk copy
Message-ID:  <199512240825.TAA22568@godzilla.zeta.org.au>

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>> Actually, overwriting valid MBR's, SecondaryBR's (inside extended
>> partitions and disk labels should fail.  It succeeds in some cases
>> because of bugs:

>That's a matter of definition.  If you're talking to a character
>device, anything should be allowed.  I have a number of disk drives

No, character disk devices are the same as block disk devices except
the latter are buffered.

>which I use for various systems at various times.  To change systems,
>I copy the whole disk to tape and then a tape copy to disk.  Under
>FreeBSD, this always fails if there is no valid BSD label on the
>disk.  BSD/OS doesn't have this problem, so I do it with BSD/OS.

This was fixed in FreeBSD-2.0.5 for drives that report their size.

Bruce



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