Mine too. I'm going to retry back in original position which is less likely to overhead or be shocked because no rubber mounts
Failing that buy a WD 7mm drive which is not ideal.
I had problems initialising the SDD drive in the optical bay. But have placed it in HD bay and it works fine.
My old Hard drive is a really snug fit in the caddy (its a 9.5mm drive) - when installed in the HD bay it sits on rubber shock absorbers and has air around it.
With a HD in the optical bay, I expect there to be some overheating or shock problems in the future.