New and improved CHKDSK
This one is a little surprising: Microsoft updated the hard disk checking and fixing tool CHKDSK, which has been around since the early days of MS-DOS. The new CHKDSK will debut in Windows 8, and use a new NTFS health model. Instead of tying up your computer when it's run, the new CHKDSK in Windows 8 will split the check/fix process into a series of stages: Detect Corruption, Online Self-Healing, Online Verification, Online Identification & Logging, and Precise & Rapid Correction.