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Date:      Sun, 22 Apr 2001 10:03:07 CDT
From:      Dave Leimbach <dleimbac@earthlink.net>
To:        "Ted Mittelstaedt" <tedm@toybox.placo.com>
Cc:        questions@freebsd.org
Subject:   RE: Duplicating Audio CDs
Message-ID:  <200104221501.IAA07370@harrier.mail.pas.earthlink.net>

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> I have heard that the ATAPI standard for CDROM's basically is the
> SCSI standard - the ATAPI developers stole most of the SCSI commands
> from SCSI-2 and put it on ATAPI.  I would suspect that an emulation layer
> would not be tremendously difficult to write - for at least a basic
> CDROM.  Of course the devil is in the details and it would rapidly get
> more complicated as more and more oddball devices were supported.

This is true the ATAPI and SCSI standards are very close.  Both are packet
based protocols with almost exactly the same commands.  I worked with Jens
Axboe <cdrom maintainer for the linux kernel> a bit trying to figure out
some strange behavior or the ATAPI drivers.  The stuff that didn't work in
raw ATAPI the way it should in any linux kernel after 2.2.14 suddenly
worked when SCSI emulation was enabled.  

But I still have to say that since burncd works so well I have no
inclination <or time> to write such a layer for FBSD.

Dave <Leimy>

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