[blue68f100]

Phoenix is better qualified to answer this than me.

You still have a weak power supply to deal with. And yes as long as you stay under the 1T limit and have a PS strong enough to handle startup and normal load. But you need to test your own unit to know for sure. This also means checking to weather you have a v3 or greater hardware. Version 1 & 2 have problems handling drive failures, particularly if drive 1 or 2 fails. The drives are configured differently, and only 1 is propoer for it to work.

Wait for Phoenix to respond if you need more detail, but he will need to know what hardware version you have.

But you can by 4 WD2500SE RE (250gig) drives for around $71 each yield a higher capacity. Remember that in raid 5 use 1 drive for parity, so 3 x 320 -320 = ~640gig give or take.