do i need to update my drivers or firmware to use the 8x blank dvds? i had been using 4x and they worked fine. when i tried to use the 8x ones, they seemed to work fine, reading the dvd i was backing up, but when it came time to burn to the disk it didn't work. it looked like it was working, leds were flashing, but it took longer than normal and it didn't actually write anything. it came out as blank as it went in. what is up with that? i'm using dvdxcopy by the way. could my writer be broken?