This could be a number if different issues, some thoughts:
You could
1) Increase the FIFO buffer (-fs) to roughly 75% of available RAM, preferably at least 512M
2) Reduce the recording speed to 1X or 2X, depending on your setup.
Either of these is likely to improve the Coaster-to-DVD ratio.
Also, the cdrecord that ships with RedHat and it's clones is often broken, you may wish to consider installing from a clean source. The output should list the buffer size, if it is 4M, regardless of the -fs setting, you have a broken version and really need to re-build from clean source.
To play a DVD in Linux you'll need to have a non-RedHat verion of GXine, or Totem or NoAtun or Kaffiene or similar player, or an MPlayer GUI. To play commercial DVD's you probably need to install DeCSS, but this may be illegal under the DMCA.
Note also that many DVD's include hidden block-level errors to deliberately cause burned copies to fail. If you are dealing with this type of problem you'll need to google to find the tools designed to get around these things.
==Joseph++
Mark Jarvis wrote:
>
> I have an NEC DVD-RW ND2500A (that's not the label I bought it under,
> but that's what it really is.) It's supposed to read/write CDs, DVDs,
> DVD+Rs, and DVD-Rs. I'm basically dual booting between XP and CentOS 4.
>
> Following the recipe in "The Linux Cookbook", I tried to copy a DVD using:
>
> dd if=/dev/hdd of=/tmp/diskfile.iso
> then
>
> cdrecord dev=/dev/hdd fs=32m -sao -v -eject -dummy /tmp/diskfile.iso
> to test and
>
> cdrecord dev=/dev/hdd fs=32m -sao -v -eject /tmp/diskfile.iso
> to actually record.
>
> I had a lot of trouble getting a good read of the whole original DVD--it
> kept getting an I/O error at 94-95% of the way through. After multiple
> cleanings and 20-40 attempts, I finally got the whole thing copied with
> no reported errors. It then took me a couple of tries to get the
> cdrecord options right and to run as root to get the requisite priority.
> The "-dummy" run ran with no errors that I noticed--there was an LOT of
> output--and "-dummy" didn't work. It wrote to the blank DVD anyway. I
> then did a run without the "-dummy". Although the original will play on
> both my PC and the DVD player hooked to the TV, the two copied DVDs
> (DVD+Rs) are coasters. DURN!
>
> Any solutions, suggestions, pointers to articles I should read, etc.
> will be appreciated.
>
> BTW, I've never quite gotten around to playing DVDs or my music files
> (mp3 and Real Player .rmj files) from Linux. I'd appreciate being
> pointed in the direction to start.
>
> -mj-
>
>
>
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