You need WinRAR, a Windows 95 – Vista computer, a file to hide and a jpeg file.
Learn how to use chkdsk to scan for errors and bad sectors in Windows command prompt, and fixed them with the /F switch for chkdsk. This works for both Internal and external USB or Firewire drives.
Open command prompts by going to RUN and type cmd .
Type chkdsk DriveLetter:Â /F
chkdsk J: /F  will check J disk and repair bad sectors
chkdsk cmd
Are you short on space, and cash? If you are, then you can compress your Windows NTFS drive, so it uses less space. Now you do not have to buy a new Hard drive. You can compress both internal and external USB or Firewire drives.
Click the link below to learn how to compress an NTFS drive without losing your files.