this means one of several things:
CDR burning protocols have very robust error checking and resolving proceedures, but at some point it
throws up its hands and reports a bad (unreadable) block. In other words -
stop buying cheap ten cent media
buy media that actually works at 24X
your burner/DVDROM laser is not set right (you gave no hint which CDROM 0 is)(Get a Pioneer)
best I can do with virtually no info