Windows 8 new file system ReFS first exposure

In the Windows 8 Developer Preview, the tester found a new file system Protogon, although locked, but in the Windows 8 Developer Preview registry The Protogon file system is mentioned, especially in the folder on the "Boot File System" and the library. You can even format your hard drive into Protogon format, which Windows 8 can recognize.
File System Protogon
File System Protogon

However, the situation has changed. Since Windows 8 Build 8139 this file system has disappeared and replaced by another new file system called ReFS. Now you can no longer find Protogon using the DOS command line:

In the new version of Windows 8, you can find ReFS directly in disk formatting:

Format VHD as ReFS file system :

Viewing from Disk Manager:

Trying to install Windows 8 on a ReFS partition:

Perhaps after FAT, FAT32, NTFS, Windows 8 will use the file system This is the mysterious ReFS.