Originally Posted by rowan

Hmm, the 300Gb SATAs are going out for $AUD110, put 6 of them in a RAID5 array and you have 1500Gb. 750Gb drives cost $AUD555 and you would need 3 of them for a 1500Gb RAID5 array.

The 6 x 300Gb array would cost $AUD660, the 3 x 750Gb array would cost $AUD1665... quite a significant price difference for the same capacity. (With a 6 drive array you may need to spend more on a controller and case that can handle that many drives)