optical

Hello everyone! I have a usb optical drive connected to my laptop (an asus sdrw-08u9m-u model) I want to burn something on cd-r using cdrecord from cdr-tools. cdrecord runs but after some seconds stops with an error (io error) I think its from driver. (I tried wodim from cdrkit port so) but...

When using dd if=/dev/zero of=/dev/cd0, I always use bs=1m. My question is: does the bs=1m actually zero a 4.7 GB dvd?

This issue has been doing my head in for hours and to be honest I've just run out of ideas. I'm trying to use libcdio to access my /dev/cd0 drive as a normal user (in group operator) but it just isn't having it. However, root works fine. Testing with a couple of programs I've found the port...