@ siudfromla, put the disc in the drive, if you have windows autorun feature on, a annoying menu should come-up saying this a blank and blah, blah, blah...however in the explorer it will apper unidentified...but its still a blank; so don't worry.
If you have alcohol 120% you can run a properties test to see if the media is blank or not. I think u can do the same in nero.
DVD-shrink requires the burning engine from nero, is your the latest? I found my burning is jinxed with nero joking..i just don't like it much use shrink burn out an image of the disc...you can shirnk it to a dvd-5 if its a dvd-9....then burn with alcohol 120% usually 9/10 it works...
If it doesnt work, remove all other cd-rom and cd-r drives then run a bear dvd-burner at master and hard-drive...this will eliminate drive clashes, and insuffcient power...
However, this should not be the case, if the drive recognises a blank media it should burn it insufficient power leads to crappy or buffer underun burns
BY THE WAY WHAT IS THE MEDIA, HAVE YOU TRIED BURNING A +R MEDIA; 1620 IS NOT A BIG FAN OF -R; UNLESS THEY ARE TY'S OR VERBATIMS...*pardon the caps lock...want you too read this first *
If all else fails...your drive could simply be rooted...current drives a re quite shocking in quality...RMA the poor bugger