when I bought mine, I selected the **320Gb** 7200rpm, and never look at 500GB as I always said to me that, for big space, NAS Server or External 1/2Tb would be the best option, as when I'm moving, **I really don't need that much space**, only when I'm at desk.


So, instead, I upgraded to a [240Gb SSD from MacSales][1] (OWC), and ... WOW, what a speed! what a thrill to use this drive! no sound, no moving peaces, faster as you can dream.

[See here a normal drive (HHD) versus an SSD booting up][2]


*image below* blue drive is the SSD drive, outside drive is the WD Scorpio Blue 320Gb

![alt text][3]


then I also bough a 2,5'' Bus powered enclosure to put my 320Gb native drive as now I use to keep my recent stuff including photos.

[![enter image description here][4]][4]

hope it helps.


  [1]: http://eshop.macsales.com/shop/internal_storage/Mercury_Extreme_SSD_Sandforce
  [2]: http://eshop.macsales.com/Video/SSD/Performance_Test
  [3]: https://i.sstatic.net/EaFcJ.jpg
  [4]: https://i.sstatic.net/mZSnq.png