Re: Files burnt to DVDs corrupt when DMA enabled, tested with Kernel 2.4 and 2.6 series.

[erik@debian.franken.de (Erik Tews)]

On Sun, Oct 26, 2003 at 12:41:12PM +0100, Thilo Schulz wrote:
> I have recently used the dvd+rwtools released by Andy Polyakov to burn DVDs on
> my Pioneer DVR-A06 burner.
> After burning, I ran a diff on the resulting files and found the burnt file to 
> be different from the original. A closer examination revealed, that a few
> chunks of each having a length of exactly 28 bytes had been written
> incorrectly to the DVD.
> The count of incorrectly written chunks depends strongly on additional
> activity to the burning process itself. The more I work on the gui (browse
> the web etc.), the more errors are written.

I think I can confirm this problem but give not so much informations. I
had a 1200 Mhz Athlon running on a board with a onboard-controller and a
promise udma 100 controller. I connected my dvd-write to one of these
controllers, I don't know which anymore and I had corrupted data too,
the system had nearly no load and I would guess that I had perpahs 5
places on a dvd which where corrupted. I used dma. The writer and the
cable worked fine in a system with a dual-p3 with intel bx chipset. I
think I was running a 2.4 kernel, newer than 2.4.20 I think. I currently
got this system offline because I am moving. If you need more
informations I will perhaps be able to gain them in a week or so.