If a CD or DVD disc is giving you this error it may be the result of a scratch or some dust. Try cleaning the disk with a soft cloth before anything else. Optical disk errors are often not repairable. If you get this error on a Mac (less common), first try the built-in Disk Utility and “Repair” the disk.
The basic scan should take around 15-20 minutes while the advanced scan may take hours. Make sure you’ve got the time set aside and don’t disturb the computer once it begins.
You can continue use the computer as normal at this point - restart when you know you have time for the full scan. If you suspect your hard disk is nearing the end of its life, get your data backed up before running the scan. Even if some data is already inaccessible, backup everything you can just in case.
Note that you must run CHKDSK commands as an administrator to have the necessary privileges to execute the scan.
The previous step gives the command for the basic scan. For the advanced scan type “chkdsk /r x:” instead, where “x” is the letter name of the drive.
If the /r repair seems to get stuck and never finish it (even if left overnight) is likely because you have many damaged files and CHKDSK will not be able to repair them. If this is the case, try the next method. Over time your hard disk may develop minor file corruptions and other small errors through a number of different means. CHKDSK can fix many small issues but cannot address more serious problems.
Many utilities offer different software versions for different operating systems (e. g. Mac OS vs PC/Windows) Be wary of “System cleaners” from disreputable sources. Look for established brands offering “disk utilities”. [2] X Research source
If the repairs still aren’t completed after the scan has run for more than 4 hours, this is a sign of a failing hard drive. Cancel the scan and backup whatever data you can.
