.CHK files are fragmented files created by Windows OS . When Windows Check Disk (chkdsk) finds a problem with the file system , it puts the fragments of corrupted data into a folder for the user. If you can Identify the format of the data you can convert it easily using only Command Prompt without any third-party tools . In the above video all the fragmented files has been identified has .jpg files so it was demonstrated how you can recover the fragmented files into identified formats.

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