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Hard Drive Freeware

Securely overwrite free space on your computer

To securely overwrite free space on your computer (no external program needed.) simply click on your Start Button / All Programs / Accessories / and right click on Command Prompt and choose Run as Administrator.

When the command prompt opens type: cipher /w:C (where C is the letter of the drive you want to securely overwrite the free space on.)

It will overwrite the free space with three passes. First with all zero’s – 0×00. Second with all 255’s, – 0xFF. Finally with random numbers.

It took about 25 minutes to overwrite 50GB of free space on my system.