Rosewill 3 x 5.25-Inch to 4 x 3.5-Inch Hot-swap SATAIII/SAS Hard Disk Drive Cage - Black (RSV-SATA-Cage-34)

I used 3 of these to retrofit a Rosewill RSV-L4500 chassis to have hot swap bays. If you still have the origional bays for the chassis, its easy to retrofit them (see pictures) to hold all the drives in place. I've got notes in the pictures on how to make them fit. The fans are pretty quiet that come with and i haven't had any thermal issues with the drives.Each bay has 2x Molex connectors. Your power supply, especially modern ones won't have molex and you will need a adapter.I wouldn't put a drive that is thicker than 26mm in it personally. It has mounting holes for both 2.5" and 3.5" drives, so it will work well with your NAS.

Bought 2 of these to install in my Rosewill rackmount server case. Work perfectly! Easy to install!

Fit like a glove in a Chenbro RM42300 4U server chassis. Other review complaints about the plastic drive trays are way off base. The trays are well made and (to me) they seem better that some of the comparable "enterprise grade" trays I've used from Tyan and Supermicro. If you're swapping drives often enough to break or wear these out, you need to get better drives or invest in an external eSATA drive dock.The other common complaints - molex power connectors and connector location - are really only relevant if you're putting this in a desktop. In a server chassis, connector placement is perfect. And the clunky old molex connectors are more mechanically secure than SATA power connectors.Overall, I think the quality is fantastic for the price. This has to be one of the best values in server components I've seen in a long time. I prefer the trays over trayless designs and the fact that they're designed to accommodate both 3.5" and 2.5" drives without an adapter shows good attention to design. Cooling is the other area where this unit excels. There is good provision for airflow (within the size constraints) and the 120mm fan runs at a sane (moderate) RPM for nice quiet operation while still moving plenty of air.I can definitely say these drive cages are going to become a standard feature in all my server builds.

Overall this is a good product. The slide in drive bays are easy to drop drives into, and they're already setup to position SSD drives correctly if you want to use those. The fan in the back is a nice big 120mm fan, seems to be standard size/setup so you should be able to swap in the fan you prefer if this one doesn't do what you want. Because of the design of the enclosure, there's not going to be a *TON* of air flow through it (even with the 120mm fan), and SSD drives won't see much benefit from the fan as the opening is on the side away from where they are mounted. (To be fair, they won't need as much cooling as they will have more room around them.) The fan is nice and quiet, pretty much can't hear it when the box is all closed up.I had a 5 GB drive that was running hot (about 40* C at idle). The uber-quiet (but super low airflow) 80mm fans didn't do a whole lot to help it, once in this enclosure the temps dropped 10* C thanks to the airflow of the massive 120mm fan. As it's basically the only drive in the enclosure currently, we'll see how that holds up once it's filled.A couple of (potential) issues.One, this is *VERY* deep. I'm dropping this into a case (NORCO 4U Rack Mount Server Chassis - Black RPC-470), and while it has a ton of room before the fan black, there was *ALMOST* not enough room for the whole thing (accounting for cables, and not getting interference with the fans). So double check that you have enough room. You *COULD* remove the fan to free up quite a bit or room if you're not concerned about temps.Secondly, the plastic housing at the front (where the drive sleds lock into place) is significantly wider than the metal housing, The metal housing fit *VERY* tight in place, the plastic wanted to catch. It took a lot of finessing, some leverage, and shoving to get it into place. It doesn't seem to affect how the drive sleds go in or lock, but if your case is slightly tighter it might not be able to go in at all. The plastic housing could be removed and the sleds still used (they wont lock, of course), that's a sub-optimal solution.Overall, I'm really happy with this housing. It works well for what I need, and once I managed to get it in was easy to use.

I ordered one of these hesitantly because I saw the issues that talk about burning up drives and smoking etc. So before I plugged it in, I did a deep dive on how it is made and came up some thoughts on the burn up issue.1. The power input is molex and very difficult to tell the keying for the molex connector in that it merges into the black case. If you inadvertently plug in the connector wrong it will apply 12v on the 5v connection which could cause things to burn up.2. The 2 power connectors are tied in parallel. If you plug in both and they are not sourced from the exact same supply it could be a problem. IE one supply providing 12v the other supplying 13v which could cause a fight in the circuity and burn things up.Other than that the box is well made and will work. Mine so far has not burned up. I gave this a one start because of the serious design issue.

It came in a Newegg box. Perfect condition. Shipping seemed much more taken care of in a Newegg box. Probably because people could tell it has something fragile and expensive in it. There is a power connector on bay three that makes it difficult to put the drive in but it works nicely if you use a little force. Hot swap works nicely just be careful the disks are still spinng for a few seconds after you eject. I got it at a great deal compared to other manufactures. Matches my rosewill nautilus case but it's a little big for it. I plan on making a 4 drive raidz 2 with these after testing the drives a little. Perfect for a 4 drive raid. I'm using it externally and it works fine.New model is okay for the money too but too different to be listed on the same page as the hot swap model in my opinion. Don't put the drives in backwards like I did at first.

Was running just fine and then a wire randomly snapped leaving my NAS in a degraded state