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Date: Wed, 18 May 2011 14:23:07 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Alexander Best <arundel@FreeBSD.org>
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Cc: freebsd-scsi@FreeBSD.org, freebsd-current@FreeBSD.org
Subject: Re: issues with new sata dvd-drive
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on 18/05/2011 13:24 Alexander Best said the following:
> i dug into this a little further and it appears that this only happens with
> CD-Rs. using CD-ROMs, DVDs or DVD+Rs this doesn't happen. i tested this with
> CD-Rs recorded under windows and freebsd (created with burncd(1), growisofs(1)
> and cdrecord(1)) and they all suffer the same issue.

Are the CD-Rs from the same vendor/batch?
Could it possibly be that there is some problem with firmware recognizing those disks?

> i also tried this with audio cds and here recoverdisk(1) fails no matter, if
> it's a CD-R or a CD-ROM:

I think that it's not supposed to work for Audio-CDs with cd(4) [unlike acd(4) and
then with bs of 2352].
To digitally extract audio data you have to go via pass(4) and appropriate
SCSI/MMC commands.

> otaku% recoverdisk /dev/cd0 ./test10.iso
> Bigsize = 1048576, medsize = 65536, minsize = 2048
>         start    size     block-len state          done     remaining    % done
>             0 1048576     243052544     0             0     243052544   0.00000
> 0 1048576 failed (Device not configured)


-- 
Andriy Gapon