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Until recently, only serious business users would consider a RAID array to increase their storage. RAID stands for redundant array of independent (inexpensive) disks. The idea is that you set up multiple hard drives working in tandem, so that the hard drives can increase storage capacity, response speed and redundancy. But today, anyone can purchase a RAID array for their home unit as well. You're seeing RAID offered mostly on very-high-end systems. On a PC, RAID uses up to three 500GB hard drives in tandem to effectively increase capacity to 1.5TB. Be preapred to pay -- at the Dell store, a RAID system adds $800 to the price of the PC. But until hard drives can hit bigger capacities themselves, this is the only way to gain ultra-storage for your PC.