Mass Effect 3 save imports

I played mass effect 1 and 2. I have them saved on my old xbox. I recently got a new 360, and wanted to move that onto that hard drive. I tried to transfer that content using a usb drive, but it says it's unable to copy that data to my usb. Anybody have any suggestions?

Did you copy it or try actually moving the save onto the HDD? Some saves don't allow for copying, just moving.