i have a problem with my sony dru-820a dvd writer from the time i bought it. when i insert a cd, dvd or any other media it often hangs my computer. when it doesnt hang my computer, it doesnt recognize that there is a disc in the drive. sometimes i am able to burn discs but often not. i sent this to the shop where i bought it but they insist that there is nothing wrong with my sony dvd writer. i once was able to burn a dvd data disc, but the drive isnt able to read the finished disc. it says the disc is corrupted. can anybody help me with it? i have the latest firmware for this drive.