RackChoice Internal Hard Drive Enclosure 5x2.5”/3.5” SATA/SAS Hard Drive Backplane 6 Gbps HDD hotswap in 3xExternal 5.25" Bay Compatible with All Rack Types

I bought two of the RackChoice Internal Hard Drive Enclosures on sale for use in a CoolerMaster tower with 6 exposed 5.25 bays. I run an UnRaid server with 10 HDD/SSDs and this is a perfect solution. As other reviewers have noted I had to make minor modifications to the internal bays of the CoolerMaster tower, bending some tabs out of the way to fit the 5-in-3 enclosures but otherwise it was a simple plug-and-play. No instructions needed. The enclosures have 2 Molex power connectors for redundancy, assuming you have two separate independent power rails and you choose to use them in a redundant fashion. Otherwise a single power connection from the PSU to the enclosure works fine. I am powering 5 HDD on a single power rail without issue using a 750W PSU.The HDD sleds require no screws to mount a 3.5 HDD, they just snap-in-place. For 2.5 SSDs screws are required and supplied with enclosure along with 5 SATA cables, but I chose to use my own cables. The sleds latch into place with minimal effort and hold the drives securely in the enclosure. The power and activity lights on each sled work as expected, so you can see at glance what bays have drives installed and when they are active.I did replace the fans in the enclosures with Noctua NF-A8 FLX 80mm fans as mentioned in another review. I have used Noctua fans in other builds and they are excellent and silent fans. It’s not that the stock fans are bad or excessively loud, but for my application and server location I wanted something a bit quieter and lower pitched. I think a lot may depend on your case size/design and the other fans installed in the case as to whether noise is an issue for you. The stock fans run at 2500rpm and in their favor they do keep the 5-in-3 enclosures a few degrees cooler then the Noctua NF-A8 that have set to run 1650rpm which is the middle speed. Even so my drive temperatures range from 29C to 34C under normal use after replacing the stock fans vs. 27C to 33C with the stock fans.Bottomline is that RackChoice Internal Hard Drive Enclosures are a good value and work well if you are looking to clean up you case and have easy access to your drives for replacement. Just to put a final point this: These enclosures are for internal use only. They have no internal controllers and are not a standalone NAS. Read the description carefully before purchasing.

I bought this to replace an Icy Dock originally in my Unraid home server. At the time I chose the Icy Dock I opted not to spend the extra money for a "tool-less" design, but have since regretted that choice every time I needed to swap out hard drives, and had to mess with four tiny screws to mount each drive in it's sled. So I decided to switch.The Rack Choice is considerably less expensive than the Icy Dock. Apparently it was deliberate on the part of Rack Choice to opt for lower cost using lighter gauge metal and more plastic. While the Icy Dock has a very solid and precise mechanical construction with a high-end feel, I think the choices made by Rack Choice make sense from a value proposition. The design and materials actually function better than I expected. (The unanswered question is whether it will be reliable long term.)As noted in other reviews, for some reason the spacing between the drive sleds is slightly inconsistent, so the design appears to lack some precision. But that's merely an aesthetic flaw. From a functional aspect it works fine. All four 3.5" HDDs (installed tool-less-ly) and an SSD (installed in the sled with supplied screws) mated seamlessly with the connectors. The insertion and removal is smooth and precise, although not with the extremely solid "feel" of the Icy Dock.I did run into one problem using the tool-less thumbscrews supplied with my case to mount the Rack Choice in the case's drive bay. Those screws proved to be a bit too long and impeded the right-most ("HDD5") sled, so I had to use the shorter Philips head screws supplied by Rack Choice.The performance of the Rack Choice 80mm cooling fan actually surpasses the more expensive Icy Dock's two-speed 80mm fan. The Icy Dock's low speed provided less airflow than I found necessary, while the high speed was far too noisy. The Rack Choice fan provides better overall cooling without excessive noise. It's likely aided by the less restrictive airflow design of it's drive sleds relative to the Icy Dock's.Since Icy Dock has been using SATA power connectors for some time, I thought the use of the Molex power connectors by Rack Choice to be a bit surprising. However Rack Choice uses two of the Molex, simplifying their design compared to the Icy Dock's with three SATA power connectors. I'm guessing that the Molex connectors are rated to handle higher amperage. Icy Dock's three SATA power connectors result in a messier rear panel with power and data connectors scattered all over in various orientations, whereas the Rack Choice connectors are laid out adjacently resulting in a cleaner design with connectors easier to access from inside the server case. On the other hand, the two Molex sockets are tightly adjacent leaving no room for "squeeze-to-release" Molex connectors, so I had to bend the "squeezers" out of the way for my Molex plugs to insert.Overall, while there are various tradeoffs, I am very pleased with the Rack Choice product. I think thoughtful choices where made to achieve a good value / performance ratio.