ebp123

I recently purchases 3 dvd burners of the same model and installed them on a fairly older PC using an IDE adapter card. The PC is 1ghz with 256mb ram. I installed all the burners as masters also. It works fine when i burn a copy of a single dvd5, but when i try to burn 2 or 3 copies at a time (from both the dvd reader or an image from the harddrive) it takes over an hour to complete. I cant figure out why it is taking over an hour to burn 3 copies when it takes less than 7 min. to burn just a single copy. Any help would be appreciated THANKS