About a few days ago I noticed that my computer was burning and writing at two times it normally would. I have no idea why, but the computer also goes a but slower as well as I can't multitask as I normally would. I am not sure what the problem is and I did erase a ton of used space so I would think it would go faster than before, as I only had about 13 GB in the past and the burns went fast.
Make sure that DMA is enabled on all drives....here is a guide: http://www.dvdplusvideo.com/dvdguide005.html