**Sorry... after typing this I found the post before me dealt with the same issue. Had tried searching for the error code but it didn't come up.***

Hello,

I have Toast 6.0 at work. Burn disc's all the time from a G5 Dual 2.5, with a Sony DVD RW DW-U21A. One day, started getting an error when trying to burn a dvd. Error comes at the beginning, when the 'writing lead-out' begins. Error is as follows:

"Couldn't complete the last command because of a Mac OS Error. Result Code = -50 "

I've tried all different dvd's... different burning speeds. Tried burning an image (that worked), than trying to burn the image onto a dvd (that didn't work).

I can still burn CD's without any problem.

Any thoughts??

Thanks muchly...