I was looking around for a cheaper SSD on Newegg and the time I'm writing this they have almost 300 2.5-inch SSD but only 12 3.5-inch ones, 9 of which are sold out. Why are there so few 3.5-inch SSD? Is it just that the demand for these drives is mostly in laptops? Why should I have to pay more for a (physically) smaller drive and then have to pay more again for a mounting piece to stick it in my computer?
closed as not constructive by Breakthrough, Dave M, iglvzx, Tom Wijsman, ChrisF Mar 8 '12 at 22:37
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I think it comes from a handful of factors:
There's probably a few other things, but those all come to mind off the top of my head.
Finally, since an SSD doesn't have any moving parts, it's not prone to moving around inside a desktop system. Unless your system uses a tool-less mounting system that requires 3.5" SATA drives with the power and data connectors in the appropriate place (e.g. Mac Pro, Dell OptiPlexes, etc.), you can just use a piece of velcro, a plastic wire tie, double-sided tape, or any other solution you can think of to keep the drive from moving very far.
For the few desktop systems I deploy that have SSDs, I just leave the drive sitting at the bottom of the case if there's no other way to mount them properly. It's far cheaper than buying additional kit just to mount them "nicely". Those systems have plenty of thermal headroom such that heat simply isn't an issue.