Be sure that you have the correct Disk #. You would not want to wipe clean the wrong disk.
A) Press the
Windows + R keys to open the Run dialog, type
compmgmt.msc, and press Enter.
B) If prompted by
UAC, click on
Yes.
C) Click on
Disk Management in the left pane, and make note of the
disk # in the middle pane of the disk that you want to
clean or
clean all. (see screenshot below)
NOTE: For example, I would use Disk 1 if I wanted to use clean or clean all on my USB key drive.

D) Look under the
Disk # (ex: Disk 3) in the left part of the middle pane, and check to make sure it says
Online. If it doesn't, then right click on
Disk # and click on
Online to make it so. (see screenshots below)

