Hello to all! I am planning on upgrading HDD speed on my MacPro 2.8Ghz quad core. The extra power is used for writing incompressible data like PSD-s and Tiff-s. After reading tons of articles on SSD drives I have reached the conclusion that the speed Vs. cost it's not yet a good deal, when it comes to writing incompressible data. Now I have got to the final solution, of using 7200rpm HDD-s RAID linked. From what I have read the best HDD-s for RAID performance are WD Re4 enterprise. Correct? (read about the apple raid card and it's not worth the money) The big noob questions are: 1. How do I link the HDD-s in RAID so that I gain more power? 2. The more HDD-s RAID linked, the more power?( Was thinking of 4x500gb hdd-s)? Thank you!