Howto use more disk space for better movie streaming

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http://ubuntuforums.org – I'm running ubuntu 9.04 Jaunty with Firefox 15.0 browser . If I try to stream a video, I get very short pieces of that video due to my limited RAM of 256 MB . Is there any way to use a part of the disk space as a cache, so that the video's would run more fluently ? (Hardware)