On some volumes, you may see a new folder called FOUND.000 with a file in it using the .CHK extension. Here’s where those come from, and what they’re for
These Are Fragments of Corrupted Files
Windows built-in chkdsk tool, short for “Check Disk”, creates this folder and file. Windows automatically runs Check Disk when it notices a problem with a file system. Those .CHK files are fragments of corrupted data—rather than deleting any corrupted data it finds, Check Disk puts it in a folder for you.
