Dave Perkes , Jul 22, 2012; 12:43 p.m.
If you are using up 500Gb for 1000 images, you are creating huge files. I have found a 2TB HDD more than adequate for 50x as many. I still need external drives; so I don't think there is any way round that. HDDs can fail, so I'd never rely only one. There is security in backing up to separate hard drives; preferably kept in a different location to your main computer.
I don't believe there is any speed disadvantage of a 2TB drive as opposed to a 1TB I have a 2TB 7200 31/2" FW disc and cannot say Ive noticed any difference to the older 1TB one I have.
If you use FW800 then you don't necessarily need a hub. I Use Western Digital drives which can be daisy chained together+ a few USB ones which are very slow in comparison.
I'd go for the 2TB with no hesitation.