|"Disk burning is very intensive."|
I honestly don't get why so many people still think disk burning is I/O intensive.
Burning DVDs at 16x uses exactly one percent of a 2.82GHz Pentium M's available cycles, and I can do all sorts of crazy stuff on it as it writes to disk. The last time I actually had to sit still while burning a disk was when I had a parallel port CD burner and Win95.
To the OP: unless the drive has buggy firmware (unlikely), I'd blame Nero. Try CDBurnerXP:
mATX Beast | LGA2011 i7-3930K @ 4.2GHz | 16GB quad-channel DDR-1866 | GTX 670
240GB SSD+2TB HDD | Asus Rampage IV Gene | Seasonic X560 | Silverstone TJ08-E