Hi, the easiest way to do this is download our Foundation Edition software onto a PC, reformat the SDcard and transfer the Foundation Edition files to the freshly formatted SDcard. Then boot in your set-up and reinstall Raspbian to the PiDrive.
Foundation Edition software download and instructions are here:
A few additional tips:
Use SDFormatter PC utility to reformat the sdcard, with options: Format Type: Full (Overwrite); Format Size Adjustment: On.
Download the Foundation Edition zipfile to your PC and unzip it directly to the root directory of the freshly formatted sdcard using 7-Zip utility:
Safe-eject the sdcard from your PC, put it in your Pi+PiDrive setup, boot up and reinstall Raspbian and any other OS instances you may want.
Let me know if you run into trouble.