c:\\$extend, what is this folder?

Sometimes when you scan the hard disk with some tools, the $extend folder will be found in the NTFS partition root directory (of course if your hard disk partition format is FAT32 won't see it anymore. Maybe some tools will report that the $extend folder is very large, but don't just clean it up (you can't see it directly, unless you use PowerTool, XueTr) If you enter the PE system, you may see it and operate it. If you delete the file or folder in the file, you may not be able to enter the system, or even reinstall Windows, because $extend It is important to save the important files of NTFS. It is so important.

If minor problems that may be checked by ScanDisk program chkdsk to repair, such as windows 7 will prompt.