Just use Verbatim DVD-R discs that were made by either Taiyo Yuden or Mitsubishi. This type of disc is the best for PlayStation 2 consoles. Other brands may cause unnecessary wear on the laser, especially on older consoles that weren't meant to read burned discs.
But since your console is a SCPH-50000 series unit, it may be having a worn out laser. Either way, try not to use cheap discs.
The burning speed doesn't matter if your burner is a decent one.
Last edited by SP193; 12-08-2013 at 01:59 AM.
Reason: His console isn't one of the older consoles that wasn't designed to read burned discs.
SCPH-10000 S. MINOKAMO v1.01 (Defunct)
SCPH-10000 S. KISARAZU v1.00 (faulty)
SCPH-15000 S. KOHDA (With warranty seal!) :D
DESR-5100 S. EMCS