Syba SY-MRA55006 5.25" Bay Tray Less Mobile Rack for 3.5" and 2.5" Sata III HDD with Extra 2 Port USB 3.0, Black/White

This is likely the best built multi-full-height-2.5" drive mounting solution on Amazon. There are others, if you're using nothing but SSDs, but at the price of SAS SSDs versus spinning rust SAS drives, as well as the diminishing redundancy caused by larger capacity drives, this makes a perfect solution for a decent RAID enclosure for one's desktop tower computer. Much less expensive than even many of the 8-drive SAS enclosures meant for smaller SSDs, and made of mostly metal construction versus the other ones out there. Throw in eight enterprise SAS drives of modest (~1.5-2TB) size and you've got a great solution for a RAID 5+0, 6+0 or 1+0 ultra-reliable or ultra-fast large-ish storage bin. Offload all those important files to a 10 or 20TB external drive that you take to off-site locations and you're pretty much covered for data integrity. As you grow and upgrade (who wants to spend $500+ each - that's $4000!!! - on eight 8TB SSDs today?) to large SSDs at a later date when they become more affordable, this enclosure will still work. One can have quite a large, reliable, fast storage bin with eight 4-8TB SSDs - all of which this hardware will accommodate. So far, so good, it looks nice and stays cool. If it continues to work well, I will grab a SAS extender and another one of these enclosures in the near future, as my old tower case has room for exactly one more.

This is the single most useful computer accessory I've purchased in a long time. I've been using eSATA docks for years, both to retrieve data from drives of other computers and for my own emergency preparation. This is a great improvement on the concept of a dock.I have a three disk ZFS mirror on my system; one disk is now in this dock instead of sitting on an external dock. In the event of an emergency (such as an earthquake), I can just pop out the drive & off I go. This is nicer than an external dusty dock & drive, plus there's no external power supply or cable necessary.Both the 2.5" & 3.5" slots have their own SATA connector & they share a power cable. Each supports SATA III and they can be used simultaneously, along with the USB ports (of course). Each bay has its own ice blue LED to indicate a drive is inserted, plus the LEDs flash purple when the drive has any activity. The blue LEDs are a bit bright, but are small & nicely integrated.The USB 3.0 connector is only for a USB 3.0 motherboard header, which is obvious from the photos & web pages. I'm surprised people give it bad marks because of this, because it's clear before you make the purchase. This is something I wanted, because my Intel dq77mk motherboard has the appropriate header and I of course had to plug something into it.(!)I have found at least three versions of this product, each with a different face plate but the same guts. There are no drivers necessary for this--just plug it in. Even if I ran Windows, this device requires no drivers and no special software.The three versions of this product that I have found are below, and the prices can vary quite a bit. It depends on your aesthetic preference, and if you want one, two, or zero locking bays:Kingwin KF-253-BKThermaltake ST0026ZSyba SY-MRA55006

This is a nice space saver when you have a short chassis. Lian Li makes great solid enclosures for ATX boards but to get the space for the internal drives, power supply, and motherboard they sacrificed external cutouts. This trayless device lets you have cold storage for backups so that you can just push a drive in, do your backup, and then extract the drive. It has a nice feature of an on/off switch so that you can leave the drive in and turn it off so that your cold storage is still in the system but not powered on.One interesting thing about this enclosure is that to cram both a 2.5 inch trayless and 3.5 inch trayless into the space of a 5.25 bay they had to use a connector on the tray that isn't a true female SATA connector. It is a SATA connector with the top plastic part of the connector removed. As a result, when you insert the drive, the SATA contacts mate through pressure from the bottom without any way to mate with the connector on the top or to maintain a tight connection with drives that are thin. So far, Hitachi, Seagate, and WD 3.5 inch drives all follow a standard thickness and mate perfectly. But 2.5 inch drives vary in thickness and I found that my Corsair SSD is too thin and so doesn't maintain a tight enough connection to be reliable. A Samsung SSD is a little thicker and works just fine. A HGST mechanical drive that I pulled from a laptop is too thin to maintain a connection.The locking mechanism is very solid and it is spring loaded so it is easy to get drives out. The front LEDs are dual color so they change color when the drive is being accessed. The USB3 passthrough works as expected.I took one star off due to the way the drives connect unreliably without a true female connector for the drive. The enclosure is fully open from the top and I don't see any reason that a full female connector wouldn't have worked in the enclosure.