Help Please: Nero DVD burning

I have P4 o?Ced to 3.0 ghz with 512 mg ram…I am using Nero 5.5 latest update off the website …when burning off an internal hDD I seem ok and get easily 4x DVD+R writing…however when burn a backup of same files off my Firewire HDD I get to a 40 % burn and the burning stops and the drive hangs…

The firewire hdd is able to burn a cdr at 52x without a hitch but not a 4x dvd + r which is about the same overall speed…52x cdr burning is about 37x cd speed…4x dvd burning is also 37x cd speed…so why I am running into this problem…any ideas

Could it be how the files are getting cached for dvd writing…is the method of burning files different for a dvd vs cd…

by the way…I tested the drive speed in Nero preferences my internal HDD had speed of 35000 kb/sec

the firewire hdd had a speed of 26,000 kb/sec…this drive is Maxtor 120 gb 2 mg cache 5400 rpm the internal drive is 80 gb 2mg cache 7200 rpm drive…

When the burn fails, does it ask to save a log file? What does the log file say?