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Why are 3.5" SSD so rare?

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Ssds are so light, that in a pinch, a single screw is enough to hold them in, so even without an adapter, you can attach them to most trays or cages if you are missing the proper mounting. If you do this, be careful when you plug in the cables that you don't break the plastic/metal around the single screw.
 
It simplifies manufacturing, lowers costs, and makes the product usable in both the desktop and mobile markets.
You now have one form factor for both these markets, and the adapter that fits between them is a piece of stamped and formed (and dirt cheap) sheet steel.

^ This is why. The laptop market helped drive the need for smaller and more rugged components (less working parts), thus the development of SSDs and naturally, given that both desktop and laptop applications can benefit from SSDs, it's simply more cost effective to standardize manufacturing sizes.
 
I just bought a 3.5" adapter for $9.99 - It can hold 2 2.5" drives in a 3.5" bay. Almost all cases have direct mounting points for 2.5" drives as well. In one of my machines I just have the SSD stuck in place with Velcro - has worked great for almost 2 years now.
 
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