News Group Posts

copying cd's cdrw cd burner

I have no idea what Jeff was using (cdrecord, probably) but I would expect that buffer settings could fix the underrun issue.

This forum thread gives an example with cdrda0.

Why can't you just dd right to the drive? If it's UDF, you can. See Using dd (instead of cdrecord and dvdrecord) to write bootable ISO images to DVD-RAM disks.

From: Jeff Liebermann <jeffl@comix.santa-cruz.ca.us>
Newsgroups: comp.unix.sco.misc
Subject: Re: COMPATIBLE SCSI CDRW
Date: Fri, 21 Jul 2000 06:56:43 -0700
Message-ID: <t1lgnsg5ulnf88qp25fga4eatbm657n433@4ax.com> 

On Thu, 20 Jul 2000 10:32:05 -0700, box986
<sbaoNOsbSPAM@voltdelta.com.invalid> wrote:

>I was in the same boat few weeks ago, looking for CD-Writable
>softwares, SCSI CD-RW drives, and found this website including
>cdrecord, and a listing of recommended CD-RW drives;
> http://www.sco.com/skunkware/cdrecord/SCO-NOTES.html

I was in a similar boat last month.  My boat almost sank in yet another
"learn by destroying" exercise.

I had a perfectly good working system with an 12x cdrom and a 2x cd-rw
burner.  I could copy cd's just fine, albiet slowly.  Then, I got a nice
new HP 9300(?) 10x cd-rw burner.  One problem: I could only copy cd's at
2X speed.  Anything faster would create underflows and trash the copy.
Tinkering with cdrecord did nothing useful.

I assumed (assumption, the mother of all screwups) that a 10x burner
would not need a source drive that's faster than the destination cd-rw
drive.  Wrong.  This derrangement does not give the CPU enough time to do
whatever CPU's do during the copy process.  If the CPU gets busy, the
destination drive gets starved for data and the cd goes in the trash.
Replacing the ancient 12x source drive with a not so ancient 32x cdrom
drive solved the problem.

Make sure the source cdrom drive, for a copy is considerably faster than
the destination burner.

-- 
Jeff Liebermann   jeffl@comix.santa-cruz.ca.us
150 Felker St #D  Santa Cruz CA  95060
831-421-6491 pager   831-429-1240 fax
http://www.cruzio.com/~jeffl/sco/   SCO stuff

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