Changing the drive is about as difficult as changing the battery - it is right next to the battery and above the work involved replacing the battery just means undoing 4 screws on the underside of the frog, unplugging the supply to the FDD, unplugging ribbon and plugging it into the FDD emulator. Personally I tried the FDD emulator in an old PC first to convince myself it wouldn't blow my frog up! Firstly I needed to format a USB stick into 100 off 1.44MB "blocks" using some software on a PC first, once that is done I put the stick into the frog and formatted block 0, then selected block 1 and formatted it, then block 2 (and so on - I did 5 in total). Then put it back into the PC, using the software wrote the up to date fixture files to block 1, intend to use block 0 for saving files for now. Will see how I get on over the next few weeks and will report back.