Hello,
The KRCConfigurator allows you to assign rights in a very fine-grained way, i.e. you also have to explicitly allow copy, paste, etc. operations, it's not enough just to see the drive. So to enable that take another look at the program!
Regarding changing the harddrive - if I remember correctly if you switch HDDs you will be asked if the RDW or the hard drive copy of it is correct (or something like that, it's been a while). If you choose the wrong one, your calibration will definitely be gone. Maybe your seller can also lend you a KUKA EMT for calibration to be on the safe side? The calibration process is really easy and quite self-explanatory.
Best,
Johannes