i also had this problem..During our burning with SONY DRU-870s (sata) make me frustrated with over 14DVD Blank copy fail to burn..
If i use max speed writing in 16x make my computer become better hangs and at the last it was failure. I try 8x speed, but my computer also hang and done our burning at 40minute in 4.4GB size onto disk. That is so long time if compare using another drive device.
I has burn using Nero 8 and also DeepBurner, unfortunately the result also same.
I`m not sure if my device is weakness using Windows XP 64bit.
AMD Phenom II 945
1x Sata Hdd
1x Sata Sony Drive
1x HIS HD4850
500W Gigabyte PW