How do I remove an EFI System partition from a drive in Windows 7?

1. On the command prompt type diskpart and answer to any possible UAC prompt.
2. On the new diskpart prompt, type list disk. Note the Disk ### column.
3. Type, select disk ### (with

   being the disk you wish to delete. Usually the disk with partition 0 with a size of 200 MB)

   NOTE: The disk may not show the 200MB partition in the disk list in Diskpart even if it exists.
4. Finish by typing, clean.
5. Type exit to exit diskpart

Have fun!

Use DBAN to nuke all partitions on the drive (version 2 supports USB) and then create a new partition using Windows Disk Management.

If necessary, backup important data, as everything will be deleted.