hmm... well the cd being unusable is understandable, but the part where the source files are no longer there is not. i tried using koncd once and it is not a very good program at all. try looking into installing either xcdroast, gnome-toaster, or e-roaster. i'm using xcdroast right now. there's the xcdroast package as well as 4 cdrtools packages, if i remember correctly. after you install xcdroast, you'll need to run it as root first. use these commands:
<enter root password>
a little pop up will appear. make sure you choose activate non-root user.
then click the set up button and:
1. check that it sees your burner
2. configure your burner options like read/write speed. actually, xcdroast does a great job of actually guessing it. for instance if i said that my burner was 4 times write speed, and i put in a cdr and proceed to burn xcdroast will figure out that i can burn a cdr at 8x's speed and burn it at that speed.
3. set up your image directory. use a directory that's writeable to everyone. i use /tmp myself.
5. save your configuration.
exit out of xcdroast and exit out of su by using the command, exit
run it as your user and set up a configuration file. basically click the set up button again. and just save configuration. all it needs for your regular user is a user config file.
hopefully your burner's okay though. mandy had a problem with lg cdroms/cdrws with installation where it killed the lg drives. i hope that hasn't happened to you though.