Chkdsk for Windows 7 is a Microsoft disk checking utility bundled with the operating system. It verifies the integrity of a volume and repairs errors when they are found. Chkdsk is run via the console and does not have a graphical front end.
Chkdsk is also integrated into Microsoft's legacy operating systems, MS-DOS and OS/2. The version of chkdsk that ships with MS-DOS 5.0 contains a bug that may cause data corruption, but this bug is corrected in the 5.0a update.
In addition to data corruption, chkdsk has the ability to detect bad sectors on the physical surface of a hard disk. The Windows Server version of chkdsk can recover data from these bad sectors when other disks in a RAID array are undamaged.