How to Make a Fake USB Genuine Again

Buying a fake USB thumb drive not a total loss because a good portion of it is genuine storage space. The manufacturer just misrepresented its true space to lure you into buying it.
Programs used:
aida64
diskpart
I bought this USB thumb drive hoping it had at least 32 gigabytes of true storage space on it. I knew it was fake but had hoped that at least half of it is genuine. Wrong!
diskpart commands:
diskpart
list disk
select disk {number}
clean
create partition primary size={number of megabytes}
select partition 1
active
format fs=fat32 quick
assign
exit