Start a command prompt, and start the DISKPART console. List all of your disks by typing
LIST DISK, then select the proper disk with SELECT DISK # (where # is obviously the SD card). You can then type CLEAN (MAKE SURE YOU SELECTED THE PROPER DISK!), and it will clear the partition table on the card.
To create a primary partition to reuse the space on the card, type
CREATE PARTITION PRIMARY. This will then reallocate the previously "cleaned" space.
To format, type
FORMAT FS=FAT32 QUICK, and finally, to reassign a drive letter, type ASSIGN.
If you're unable to determine the proper disk, remove the SD card, run
DISKPART and LIST DISK, and then re-run it with the SD card inserted. The SD card is just the disk that has been added.
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