all cds read 100%, 50% read on dvds

[FDD]

Hi

I was wondering why all my cd based games read perfectly (rips, backups and originals), while all my dvds read like crap (backups and originals) - only about 4-5 tries before it reads, sometimes i couldn't make it work.

The only dvd media that has a higher success ratio on being loaded on my ps2 are silver sided dvds.

I'm really stuck. help!