Here's a cool one. SilverStone has put together a very different sort of hard drive. It is called the HDDBoost (SlashGear) and (the company claims) it can boost HDD performance by up to 70%. It allows users to connect any 2.5" SSD to any 3.5" HDD. The drive creates a mirror of the front end data of the HDD and puts it on the SSD, which allows your computer to access those files much faster.
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The best part about this drive? No special software is required. Just plug the drives in and the hardware takes care of everything automatically. The total price is around $50, although the device is only available in Japan right now. That should change if this thing really does work as advertised. It sounds like the perfect stop-gap between HDDs and SSDs.