HELP choosing a Hard Drive

[dunkaroos]

I'm deciding on a hard drive for my new computer. It'll be used primarily for programming, graphics, rendering, etc.

Look here:

	Single Drive
	250GB 7,200RPM w/ Free Fall Protection [subtract $10 320GB 7,200RPM w/ Free Fall Protection [subtract $75] 500GB 7,200RPM w/ Free Fall Protection [subtract $25] May delay your Alienware M17x ship date 640GB 5400RPM [add $30 or $1/month[sup]1[/sup]] 128GB Solid State Drive [add $129 or $4/month[sup]1[/sup]] 256GB Solid State Drive [add $420 or $13/month[sup]1[/sup]] [size=-1]Enjoy Faster Game Load Times & Solid State Reliability![/size]
[img]http://i.dell.com/images/global/configurator/general/selected_closed.gif[/img]		Raid 0 Performance
	320GB - 2x 160GB 7,200RPM - RAID 0 [subtract $5 640GB - 2x 320GB 7,200RPM - RAID 0 add $0 1TB - 2x 500GB 7,200RPM - RAID 0 [add $50 or $2/month[sup]1[/sup]] May delay your Alienware M17x ship date 512GB - 2x 256GB Solid State Drive - RAID 0 [add $940 or $28/month[sup]1[/sup]]
[img]http://i.dell.com/images/global/configurator/general/selected_open.gif[/img]		Raid 1 Protection
	320GB - 2x 320GB 7,200RPM - RAID 1 [Included in Price] 500GB - 2x 500GB 7,200RPM - RAID 1 [add $50 or $2/month[sup]1[/sup]] May delay your Alienware M17x ship date

What is this "Raid 0" and "Raid 1"?

Thanks, NT.