toshiba hard disk losing gbs

  1. 4

    missing 35 gb from hard disk.

    hi, hope someone can help. My Toshiba satellite c50-b laptop has suddenly lost about 35gb from its normal 500gb. The shop is telling me this is due to a) Microsoft hiding the operating stem or b)'natural wastage'? I think this is lies but can't refute their claims. The disk management...