If you want to re-use a drive (maybe as a spare or what-not) sometimes there can be a recovery partition on it. Here is how to delete it so you can have a 100% usable drive:
Open the Diskpart application by either typing in "Diskpart" (without the quotation marks) into the search, or type "Diskpart.exe" into Run by pressing the Windows key + R.
Now with Diskpart open, you must enter the following command lines:
I. Type "list disk" without the quotation marks and press enter.
II. Type in "select disk 0" and press enter.
III. Then type in "list partition" and press enter.
IV. Then type in "select partition x" x=the recovery partition you wish to delete (i believe it's 1, i dont recall) replace x with the recovery partition number and press enter.
V. Then finally type in "delete partition override" and press enter.