What happens during a disk check?

I recently receive messages to run a disk check at the beginning so I wonder what exactly happens during a disk check, how long it takes and what are you doing to stop in an emergency. I would also like to know the consequences of not doing it soon enough and what it does exactly.

It only checks that each file is correctly written to disk by making sure that record of the file system matches the actual file (for example, the size of the recorded file and the actual size are the same).  It takes a lot of time to read all the files, that is why a CHKDSK process can take several hours (or more).

CHKDSK scans are not necessary and should not be executed unless your computer has a problem.  The NTFS file system is a file system jounaling which is very resistant to errors and correct them if necessary.  It can handle the delayed write failures and power outages and will schedule controls when necessary. In most cases, running a check of your own is just a waste of time (and the use of unnecessary disk, which will reduce the life expectancy of your hard drive).

You can finish it safely if you want, simply press Ctrl-C together.

Tags: Windows

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