Quote Originally Posted by Taeke
.. When booting, the progress is shown on screen. Many read-errors from the CD-rom are reported. That leads to my conclusion about the read/write errors.
I don't think a corrupt iso would show up as read-errors on booting. After all, if the iso is corrupt and then written, it's not a read error when you get the same corrupt data back. You could indeed have a drive problem, media problem, or something ralated.

My thoughts: Get an iso which has a good md5 sum (check it under Windows since you can hardly trust anything under Knoppix at the moment since your version could be corrupt). Burn it nice and slow (as you have done), use a different brand of media if you have more than one brand (I would have trouble counting how many brands I have around but I realize many people just have one brand at any one time). Maybe even use a 700 meg CDRW if you have one (to avoid further waste if problems persist). If you have access to a second burner, use that instead. And if you can try booting the CDs you make on more than on CD drive (multiple computers or a boot manager that lets you boot from other than the first drive) go for that too, as a test of is the problem with the written CD or with reading it on booting.