![]() ![]() Something could very easily go wrong with this cable and it could end up corrupting your data. You connect your NAS to an expansion unit with a single cable which is a large point of failure. The prevailing sentiment from all the reading I've done and the YouTube videos I've watched is that you should not rely on expansion. How can it support 18 hard drives then? Because two DX517 expansion units can be connected to it, each of which have 5 drive bays themselves. ![]() The DS1821+ name indicates that it supports up to 18 hard drives but if you look the DS1821+ product page you'll see there are only 8 drive bays. Let's look at an example to try to make things a bit clearer. How many drive bays your NAS has is probably the most important decision you will make because it determines how much data your NAS can store before expansion. Drive bays are the physical openings in the NAS where you can insert hard drives. Wait a moment? Why are we talking about drive bays instead of hard drives? Isn't that the next component in Synology's naming convention? It is but unfortunately the maximum number of hard drives supported does not always equal the number of drive bays your NAS will have. And even if you do know what those words mean then you probably don't care what is written here because you most likely know more than I do. Unless you know what the words "rack mount" mean there is no way you are going to want anything other than the desktop form factor. For 99.99% of the people reading this, you are going to want a desktop NAS that can be put on a shelf or stuffed in a closet. This is going to be the easiest decision you have to make because the answer is "DS". Now that we can break Synology model names down into their component pieces, we need to come up with our answer for each piece. RS3618xs is a rackmount form factor that supports up to 36 hard drives from their 2018 model year of the XS+/XS series.DS1621xs+ is a desktop form factor that supports up to 16 hard drives from their 2021 model year of the XS+/XS series.DS1821+ is a desktop form factor that supports up to 18 hard drives from their 2021 model year of the Plus series.DS1819+ is a desktop form factor that supports up to 18 hard drives from their 2019 model year of the Plus series.DS920 is a desktop form factor that supports up to 9 hard drives from their 2020 model year of the Value series (because there is nothing after the model year).DS420j is a desktop form factor that supports up to 4 hard drives from their 2020 model year of the J series.Everything that remains defines its series.īut I'm not even sure that explanation is clear enough so let's break down some examples.The last two digits are the model year.One or two digits which represent the maximum number of hard drives the NAS can support. ![]() For example, DS for DiskStation, their desktop product, or RS for RackStation, their rackmount solution.
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