http://www.cooldrives.com/harasaiipomu.html Want HUGE external drives, this above link is for you. A 5 bay, hardware raid-0 (recomended for max storage) or raid-1 mirror for 1/2 the capacity with duplicated data safety (auto rebuild on errors). Running with 5 Seagate ST3750640as-rk (SATA II) (compusa/bestbuy $319.00) 750GB drives in raid-0 produces a massive 3.75 TerraBytes. Will also work with smaller drives. now starting to record HD movies as fast as I can, may take a while to see if the HR20-700 can/will address it all. Setup must be completed via a pc or mac with external E-SATA port so you can choose which raid level before hooking it up to the hr20-700. So far it seems to support dual recordings and play with no glitches or pixelation. More info to come later.