Originally Posted by johnzm
maybe you dont need 4tb, but i am about to start building an array, and the obvious choice for future expansion is to go with the biggest you can get, or close to it.
True, but the only case for "requiring" the biggest you can get is when you are limited on your bays (i.e. microserver)
It doesn't seem obvious to fill a 20 bay array with 4 TB drives for 80TB @ $4000 ($199 each) when you could go with the much better price point of 3 TB drives for 60TB @ $2400
Put the extra $1600 in the bank let it grow some interest and then swap them out for 6TB drives or whatever is more economical down the line
Obviously my example is pretty extreme, and depending on your case you can effectively see a "hard limit" on drive bays. I'd suggest if you're case limited to strongly consider a larger case (like the Cooler Master Cosmos) for even a steep price due to the additional storage. The savings you would get from the extra bays (and ability to add the cheaper 3TB drives to fill those bays) would offset the cost pretty quickly. With a 4in3 5.25 to 3.5 converter, the Cosmos could hold 17 HDDs