Let me clarify:
By the same size, I meant capacity. Number of GB.
You have been sorely misinformed about RAID. See here for details:
https://en.wikipedia.org/wiki/RAID . RAID is a set of ways of combining multiple identical drives into a single volume, with data spread across multiple disks for speed and / or redundant copies for survival in case one drive dies. It's complicated, it's fun to play with, it's a disaster for recovery if your data goes bad or if your RAID unit dies, since the drives almost certainly won't run in another RAID unit. They're not standard.
NAS is Network Attached Storage. A NAS unit can support RAID volumes or not, only supporting drives as single volumes. The two features are actually independent.
The ORICO looks like a decent unit. It can present the drives to you as JBOD (Just a Bunch of Disks) without doing any RAID voodoo on them. In fact, I don't see support for RAID. So it should do what you want, but apparently it doesn't.
The questions I'd ask to figure out what to get are
- What's unstable about that unit and will their support help you? If that works it's fine for your needs and you already have it.
- Do you want all of these drives available at the same time, or one at a time is fine? This tells us whether you need a single unit that can hold five drives (expensive) or not.
- How large (in GB) are the drives? If you have five small drives it's going to be easier to replace them with a new large one, and cheaper than buying an external five-drive unit.
- How elegant must the solution be?
- - Personally, my computer has a hot-swap dock from Kingwin. I keep my 3.5" drives in a rather fancy anti-static case, and just plug one in to the computer when I need it. It's attached at full SATA speeds. This is my favorite, but not good for making your PC small.
- - There are cases with docks built into the top. There are external docks that sit on your desk and you can connect any drive to USB 3.0 on any computer, such as my Kingwin True Dock that I use for my Mac ( http://www.kingwin.com/storage/docking-stations/docking-station-td-2535u3/ )
- - If you won't be attaching them for long, and you don't mind ugly, there are SATA to USB cables for cheap-cheap-cheap. Such as
https://www.newegg.com/Product/Product.aspx?Item=N82E16812329640&cm_re=SATA_to_usb-_-12-329-640-_-Product , no endorsement.
In short, there are a lot of variables to pin down. Main are how many you need to use at once, is the use temporary or long-time, aesthetic and cost solutions. I'm willing to discuss it in detail if you wish, otherwise I would suggest an external desktop dock if you only need one at a time. If you need them all, I'd first see if the total combined size will fit on one new disk and then use that with a desktop dock. Last choice, because it's expensive, is a unit like you bought, preferably a JBOD one (less expensive than RAID and why waste money).