Revert Bootable SD (and USB) back to normal?

Zeallot

Honorable
Jun 20, 2013
74
0
10,660
Hello forum,
Once again I'm searching for your assistance, seeing as the community here always has some helpful insight. Recently I had ordered my Raspberry Pi B+, and I was installing the RetroPie 2.2 OS onto it. I had created a bootable SD for the Pi, rather than a MicroSD (factory B+ doesn't support SD). Anyways, it was created with Win32DiskImager. Unfortunately I don't know how to go about reverting it. On the USB I had did the same (Tried to see if the Pi would boot from USB). On the USB I tried to format it through disk manager, but I can't seem to extend the volume with the unallocated space. I'm looking for a solution before I try the same approach on the SD card.
Thanks in advance, Zeallot.