C: $extend, what's This folder?

Sometimes when you scan your hard disk with some tools, you will find the $extend folder in the root directory of the NTFS partition (of course, if your hard disk partition format is FAT32 you will not see it), some tools may report that the $extend folder is large, but do not casually clean up ( You can't see it, you can't clear it, unless you use PowerTool, XUETR and other tools, or into the PE system to see it and its operations, if mistakenly deleted $extend or the file or folder, may lead to the system, or even reload windows, because the $ Extend is an important file for NTFS, so simply put, it's important anyway.

If it is a minor problem, you may be able to fix it by using the ScanDisk check, as Windows 7 prompts you.