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#11
And most 3.5" hard drive trays today have a design where it has 4 holes already there and all you have to do is screw the ssd down to it. That is if you can spare that hard drive bay, and if the ssd comes with screws, most don`t.
If not Velcro is fine and you can put it where ever you want, I just used a 3/4" square piece to hold my new 860 on top of the hard drive cage.