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Date:      Wed, 6 Jan 1999 08:07:20 +0100 (MET)
From:      Luigi Rizzo <luigi@labinfo.iet.unipi.it>
To:        nathan@rtfm.net (Nathan Dorfman)
Cc:        ken@plutotech.com, mike@smith.net.au, committers@FreeBSD.ORG
Subject:   Re: proposed atapi-cd patch
Message-ID:  <199901060707.IAA05204@labinfo.iet.unipi.it>
In-Reply-To: <19990105173201.B21538@rtfm.net> from "Nathan Dorfman" at Jan 5, 99 05:31:42 pm

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> On Mon, Jan 04, 1999 at 04:46:24PM -0700, Kenneth D. Merry wrote:
> > I think it might be easier if the cd9660 code could handle the track offset
> > stuff.
> 
> I've never actually tried this, but is there anything restricting a data
> track from being anything other than an ISO9660 filesystem? E.g. UFS track,

nothing. As a matter of fact you can use a cd as a dump device (except
that you better keep streaming when writing to the disk...).

In the past i tried to dd a UFS partition to a CD. In 2.2.1 times it
was even possible to mount it readonly (although i had a panic at
some point and i am not sure what was the reason).
With 2.2.6 this was not possible anymore. I haven't tried with -current.

> dump or tgz track, etc. If not, putting this track offset code in cd9660
> would be a little limiting, no?

this is actually a good point, although then you need to resort to the
minor number trick (or modify all filesystem codes to let you add an
offset to the start of the filesystem).

	luigi
-----------------------------------+-------------------------------------
  Luigi RIZZO                      .
  EMAIL: luigi@iet.unipi.it        . Dip. di Ing. dell'Informazione
  HTTP://www.iet.unipi.it/~luigi/  . Universita` di Pisa
  TEL/FAX: +39-050-568.533/522     . via Diotisalvi 2, 56126 PISA (Italy)
-----------------------------------+-------------------------------------

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