you know, the BenQ DW1620 is a great burner.... but that doesn't make it a miracle worker. Please try using some good media on it. Optodisc, Prodisc DVD+Rs, Taiyo Yuden, Ritek.... anyone of those will do.
Punch Cards -> Paper Tape -> Tape Drive -> 8" Floppy Diskette -> 5 1/4" Floppy Diskette -> 3 1/2" "Flippy" Diskette -> CD-R -> DVD±R -> BD-R
The Progression of Computer Media