Good question! After reading all the other posts about burning issues, ie bad cd roms, compatibility issues with windows burning software, nero, boot sector id, etc. I decided to take all the variables out of the equation. I don't want to guess if it's a bad disk, bad burn, or even a corrupted download if it dosen't work. The thought of the thing having to be pulled out of the dash after it's been working so well creaps me out...I asked the tech if just the hard drive could be swapped out in the event of a non-recovery after an update and he said"no."