On Wed, 2009-04-15 at 15:46 +0200, Niki Kovacs wrote:
Michael A. Peters a écrit :
- Am I supposed to be root to use cdrecord and burn an .iso file?
I've found it works much better if you are root.
I tried both, and see: cdrecord complains about not being able to set certain priorities while being run as user, which induces a high risk for buffer underruns. So I have my answer for that.
Another cdrecord-related question. Usually I should be able to copy a CD as simply as that:
$ dd if=/dev/cdrom of=copy.iso
Then insert a blank CD, and:
$ cdrecord -v -eject dev=/dev/cdrom copy.iso
Now I did that for data CDs, and it works very well. I thought, normally this *should* also work for audio CDs, so I gave that a spin. But everytime I try it, dd stops short and gives me an "Input/output error" for /dev/hdc.
I tried three different audio CDs, all three in good state. I can listen to them OK on the PC. But all I get with dd is a zero-byte-length copy.iso file.
Any idea what's happening?
Try padding copied image with a few hundred k of nulls.
dd if=/dev/zero of=copy.iso \ seek=<number of output blocks to skip forward> bs=2048
I've had to do this for my ISO images depending on the age/brand/model of the device. It seems that (at least in the past) there was a disconnect in the kernel handling of the end of file and writing the last blocks read in. This cured it.
I can't say if this would affect audio CDs as well, but worth a try.
Niki
<snip sig stuff>
HTH