The following is a 4 GB USB Flash drive. running computer with no hard drive attached. The USB OS is programmed to use RAM memory in such a way, that entire 500 MB Video AVIs can be downloaded directly from Internet to RAM, and everything else smaller including youtubes, and cache, to prevent constant USB writes. USB Flash drives are also called 'Key Drives', 'Thumb Drives', 'USB sticks'
![](http://f.imgtmp.com/Ybyz0.png)
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