Data backups to CD-R recognized by MP3 player but not CD-Rom

[Kidd343]

I tried posting this in off-topic but I'll try here as well, since I'm not sure where to categorize this. I used to backup all of my stuff to blank CD-r before I bought my external HD. They all worked fine whenever I needed to access any archived files. Now I'm transferring them to my external HD and somehow a couple of discs read as 0 bytes with no CD title name. I tried using the CD in both a regular CD-rom drive and DVD burner, and they both read it as 0 bytes. I know that shouldn't be because I have lots of stuff on these two CD-Rs, so I put it in my MP3 boombox to see if it will read it. Sure enough, it finds the MP3 files that are burned in the CDs (it has mixed media burned in them like mp3, jpg, mpg, etc). What gives?

Thanks!

[Kidd343]

Can someone please reply? I'm going nuts trying to figure this out!