My cable TV company gives me a Cisco Explorer 8640HDC DVR box that can record shows from TV. I know that it contains a hard drive to save the shows on. What format and file system are used to store the videos on the hard drive? I have looked at the documentation for this DVR box and there is no technical information about the manner in which recordings are stored. Is it possible to connect the hard drive to a computer and extract the recordings from it?