CHKDSK (Check Disk) is a command-line utility that scans the file system and the disk surface for errors and attempts to fix them. CHKDSK can also recover readable data from bad sectors and mark them as unusable. A technician can run CHKDSK on a corrupt drive using various options, such as /f (fix errors), /r (recover data), or /x (dismount the drive). Running CHKDSK can help the technician repair the drive corruption and retrieve the missing files. Reference: How to Check Your Hard Drive's Health | PCMag1 How to Check a Disk from Windows - dummies2 How to Use CHKDSK in Windows 10 - Lifewire3