A tank capable of containing a liquid has a first volume capable of containing the liquid, the first volume having at least one opening initially sealed by a first wall and the first wall being capable of being retracted when a pressure exerted thereon exceeds a specific threshold. For each of the low frequency components, quantized phase differences between the current block and the candidate block are calculated. The PVR enabled STB may be operable to cause display of the stored advertisement and the media content in different transport formats. The fork head also has an angle of inclination, which divides the plurality of tines into an upper portion of tines at a first angle to the handle and a lower portion of tines at a second angle to the handle.