CDFS, or Compact Disc File System, is a type of file system used to burn data onto CDs. The main advantage of using the CDFS file system is its compatibility with a wide range of operating systems such as Windows, UNIX and Mac OS. If you want to create a backup of a CD containing CDFS data onto your hard disk, you can do it just like you would create a backup of any other CD.
Insert the CD containing the CDFS data.
Open Windows Explorer by double-clicking the "Computer" icon on the desktop.
Right-click the icon of the CD or DVD drive and select the "Copy" option.
Use Windows Explorer to go to any location on the hard disk that has around 700 MB (megabytes) of free disk space.
Right-click and select "Paste" to back up the CD containing the CDFS data. The data on the CD will automatically convert to the default file system on the hard disk.