Mac is the first ever operating system that you can run trough your USB. you can install or load mac operating system in your flash memory. a 8GB or 16GB is sufficient for loading MAC operating system after loading this you can port this Pen drive to anywhere you want and you can use your HDD for storage your documents. MAC is the only and first ever operating system you can run trough your flash device it is because it is very unique kernel based coding so what you have to do get a USB install MAC on it and get ready to experience the new feature ever.
The designing phase of MAC is the you can to link with your external device the feature make it easy to use.
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