I’ve been having the same problems with my P2 store, it’s very frustrating. Some of the fixes that have been said to help is to copy the .txt file first and turn off the motion sensor in the P2 Store. Apple is recommending making a disk image of each partition and copying that. BTW I don’t think the copy problem is due to the files being locked more to some sort of read error. I’m actually going to load windows XP on my MBP just to update the firmware on my P2 cards and P2 Store and get the ability to turn the motion sensor onoff – wondering if anyone has done that with success.