Problems with Drive in 1 to 1 Duplicator

I am having problem with a 1 to 1 duplicator burning DVD-RS…
Source drive is reading ok but when I go to burn target drive reads d:100%.
I am using NEC Dvd/re burning drives…
Could this problem be due to having 2 DVD/RW burning drives?
Any help appreciated .Jim :o :a

Please ask the duplicator manufacturer!

By no means this is a question for a newbie forum!

Jim, please don’t double-post the same question. Other thread deleted.

Transferring to General Hardware forum…

My apolagies for that…I forgot I had already posted