CDRW: cdrecord: No disk / Wrong disk!

[Zbigniew Koziol]

Lenard,

Thanks a lot for your suggestions. Thanks to others, too.

On Friday 14 July 2006 21:37, Lennart Sorensen wrote:

> > What is the role of DMA during the recording? One of tools I used on
> > Linux throws out a message that there is no DMA at all. Is that
> > important? That particular CD drive works as a secondary master.
>
> The author of cdrecord to put it mildly is a bit nuts.  He hates how the
> linux kernel developers have decided to handle atapi and prints out lots
> of warningsa (which only apply to a few specific kernel releases) on just
> about every kernel version.  DMA is important for decent recording speed
> (I wondered why a DVD was taking 2 hours to burn on my machine, when
> something accidentally disabled DMA.  With DMA enabled it took 15
> minutes instead.)  Without DMA the cpu has to copy every byte to the
> device, while with DMA the cpu just places the data in ram, and tells
> the device the address in ram to go get the data, and the
> device/controller takes care of getting the data there while the cpu
> goes and does something useful instead.  This is much faster and much
> more efficient.
>
> To check if DMA is enabled do:
> cat /proc/ide/hdc/settings|grep dma (where hdc is your writer).

DMA is enabled. Strange that one of the programs complained. I do not bother 
to check again which one.

To conclude the story: I bought another CD burner, an LG one. It worked 
wonderfully right away!

zb.


> Len Sorensen
--
The Toronto Linux Users Group.      Meetings: http://tlug.ss.org
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml