Yeah, This didn't work for me..
I was trying to combine an old 1tb drive with even an older 750gb drive onto a new 2tb. Both older drives had some of the same recordings since I had done a copy once before.
I'm still sorting through the results but a lot of the duplicate programs are corrupt and even some of the programs that were new on the 2tb drive were corrupted. When selected to play, Some of the copied videos would immediately give you the 'delete' option but after selecting 'no' it would play from the beginning. Very messy.
This may sound convoluted but I think I'll have to delete all the copied videos from the 2tb (leave the new ones) and just stick to copying one drive to the 2tb.. Any advice? Anyone?
If you really want to try something, and have the time, here is what I would do. I'd fire up both drives independently, and get rid of all duplicate recordings. I'd try and make one have as many recordings as possible, and leave one with as few recordings as possible. Then I'd copy whichever one had the most shows left to the 2tb drive. Then, there is a thread here abut how to copy individual recordings one at a time. You could then try that method to get the rest of the shows from the remaining drive to the new one. If you do that, I'd just move one over and then test to see if it worked, before i moved all of them individually.
Just something you can try if you have time to kill.