Changes are a-coming to chkdsk and NTFS health in Windows 8, and unlike the controversial Metro interface, these tweaks should make everyone happy. As hard drives get bigger, the Windows 7 chkdsk times get longer (and longer, and longer…) when hard disk errors occur, as infrequent as they are. In a worse-case scenario, attempting to boot a corrupt drive can take hours. The new system changes all that.
The Windows 8 improvements will let NTFS try to identify corruptions on-the-fly and make an instant fix in the background, no usage interruptions required. If that doesn't work, Windows 8 will conduct a "spot verification scan" to determine if the corruption is genuine or just a brief memory glitch.
Genuine errors will be reported to the user and the OS will start scan the system during idle CPU/storage times and log the location of the problems. When the scan is done, Windows 8 will prompt the user to reboot the PC at his convenience. Chkdsk will then use the information NTFS logged about the errors to fix the corruptions quickly.