I need an external enclosure with removable hard drive bays allowing me to easily and quickly swap 3.5" SATA hard drives. The drives will function as file storage and backup drives of these (hence the need for at least 2 drive bays so I can copy between them). It should have the following features: Work with ANY 3.5" SATA hard drive (no limitation to SATA II only, only up to 2TB or 3TB etc. as with some enclosures) Allow for bare drives without any tray, caddy or special mount The drives will be set up as individual (JBOD) drives, so RAID support isn't essential (but welcome in case I need it later if the price isn't a lot higher) Have at least 2 drive bays (4 is even better, but depends on the additional cost) Have at least an eSATA interface (preferrably also Firewire 800, but since SATA + Firewire interfaces seem hard to find and I can always network my Powerbook G4 through my Mac Pro for drive access I can live with just eSATA) Be silent (no noisy fans! Possibly with temperature controlled fans to keep noise levels down) Be Mac compatible of course! Here are some enclosure I've found which seem to have some/many of those features: Sharkoon SATA QuickPort Duo v.2 (2x bays, SATA, USB 2) Sharkoon SATA quickport Quattro (4x bays, SATA/USB 3) Thermaltake BlacX Duet (2x bays, SATA/USB 2) StarTech SATA HDD duplicator dock SATDOCK22RE (2x bays, SATA/USB 2) Orico 8648rusi3 (obsolete) (4x bays, SATA/USB 3/Firewire 400 & 800) Orico 9849rusi3 (obsolete) (4x bays, SATA/USB 3/Firewire 400 & 800) Orico 9648rusi3 (replaces above 9849 model) (4x bays, SATA/USB 3/Firewire 400 & 800) -not sure what specs differ except the rack ears and openings for the front LEDs look slightly different. Orico 6204ss (for mounting in a 5.25" drive space -I assume PC type enclosures with power supplies can be bought for this purpose) (4x bays, SATA) Orico 6205ss (similar to the above, but for an additional drive) (5x bays, SATA) OWC Mercury Rack Pro (looks very similar to the two 19" rack units from Orico, doesn't it?) (4x bays, SATA/USB 3/Firewire 400 & 800) The 8648rusi3 (obsolete but still available many places online as far as I can tell) seems to be a good choice, as do the Orico and OWC 19" rack units (but at a price). I don't know enough about how the 5.25" Orico devices connect to the Mac -if they're simply mechanical units meaning they can use any SATA interface inside a DIY 5.25" PC enclosure, allowing for simple upgrading (of the SATA interface) if newer, larger SATA hard drives appear in the next few year that no longer work with the current SATA interface inside the PC enclosure or not. The drive docks would of course be a simpler, cheaper alternative to all the above but none of them support Firewire and they're probably less sturdy/more fragile and lack cooling fans (except for the 4 bay Sharkoon above). So what do you suggest I go for, and does anyone here have any experience with any of these (or similar) solutions?