Be aware that if you are using Nero to burn your disks,
in the burn dialog box, there is a check box to verify
the data after burning. I always have that checked - it
is interesting to listen to the drive -- with junk media,
usually about 2/3 of the way through a verify, you hear
the drive starting to change speed and hunt as it tries to
read the data. With good media (I have had good results
with the Japanese Fuji CD-R and Taiyo Yuden DVD-R),
the verify pass starts and just runs to the end with no
change in drive speed. There are also a number of
utilities out there like DVDInfoPro (good and inexpensive),
others for free, that will scan a disk for you and report any
read errors (or areas where it takes multiple passes to read).
mikey