With five disks, the LaCie 5big lets the user custom-make RAID configurations.

ENGADGET: LaCie announces the 5big Thunderbolt series: up to 20TB capacity starting at $1,199

Seagate Technology and Hitachi GST have both announced 3.5-inch form factor HDDs with storage capacities up to 4 terabytes (TB) on five disks.

FORBES: Is 4 Terabytes Enough?