Things You'll Need
Instructions
Download and install "WBFS Manager" (see "Resources").
Connect your Wii hard disc drive to your computer with the USB cable. Open "WBFS Manager."
Click the "Drive Letter" drop-down menu, then click the Wii hard drive's drive letter.
Click the "Format" button and click "Yes" to confirm that you want to format the hard disc drive. When a "Success" window appears, your Wii's backup disc drive will be repaired. You can now recopy your backups to the drive.