Remove undeletable partitions on flash cards

There are times when partition manager won't let you remove partitions on a flash card. To remove these partitions, it is necessary to run diskpart.

Invoke diskpart in administrator mode.

diskpart
list disk
select disk X (where X is the disk you wish to clear the partition table)
clean

At this point, you can proceed to create a new partition using diskpart or creating a new partition using the partition manager.