I have two NAS boxes, both at least five years old, that need replacement. They're slow, only 100mb ethernet nd USB 2.0, each one holds four drives, currently using 1TB drives in each box. Total capacity across both boxes is 5.4TB. I have already replaced two drives due to hardware failure, so I know the things are aging, and not gracefully. Both arrays are used for constant online access via secure FTP and other secure file transfer protocols, so they're constantly getting beaten up on. I want to replace both these units with a single RAID 5 array of four 3TB drives, giving me approximatley 9TB of storage. I won't use anything larger than a 3TB drive because I don't yet trust the new drive technology that squeezes more platters, closer together, in the same physical cabinet with a 3.5-inch form factor. The higher you go in storage capacity, the more platters, or the more cylinders and tracks, you know the drill. OK. I just looked into four-port RAID controllers and found exactly none. Quite surprising really. I thought even the Vantek 622 would be a good choice, but it has two internal and two external connectors, and in this big case I have five bays available, four of which will hold my 3TB drives with possible expansion to a final fifth drive in the RAID array. So, what do folks like in RAID controllers, or am I barking up the wrong tree and should do this outboard?