Pioneer DVR-117 not burning with some media

Hi,

So I’m having this recurring problem with my burner. I can’t get it to burn with Memorex or Verbatim disks. Is this common with other users? I’ve got it mounted in an OWC enclosure w/Firewire to my iMac.

TIA,

Mark

Post some more info, otherwise even an crystal ball cant help to solve the problem.