|I verified that the discs could be read when they were made.|
I think the discs are CDR.
I never overburn
I was using windows XP then and now.
The data is mostly picture and video files.
Certain files when read will not read and lock up windows explorer. The only way out is to eject the disk. The files most likely to do this are the ones in the root directory and the last files in the last directory.
I can read some of the CDs and no problem with watching DVD movies with the drive.
I just purchased a samsung external DVD writer. It has far fewer problems reading the discs but there are still some discs that have files that it will not read.