If you're swapping the 2TB disk in your Airtime Capsule, a 4TB 3.5" SATA drive should work fine. Go for one with 7200 RPM for better speed, and make sure it's SATA III (6Gbps) for the best performance. Stick to solid brands like Seagate, WD, or Toshiba. Just double-check that the drive fits and...