I just returned another batch of 4X +R disks(Memorex)to Circuit City. One of the clerks explained that he use to be a tech ann asked if I enabled my DMA, into PIO on the motherboard? He explained that Sony may have the motherboard default at DMA, hence my burn probablem. I don't know what F key to hit at startup and I'm not sure what I'll find once I access the bios, could someone explain this to me-talk to me like I'm 4. Thanks!