I recently updated my windows 10 32bit to windows 10 64bit. I used the windows update tool to download the OS to my external harddrive. Once downloaded, I set the USB as priority boot in the BIOS settings and got windows 10 64bit no problem.
The problem is when i go to use my passport after like a normal USB. A) I've lost all my files on there. B)Its dropped from a 1TB harddrive to 37.1GB
Any help would be much appreciated seeing how i need the harddrive for work.