Booting from HDD/SSD in optical drive bay.

Macbook Pro 15" non retina mid 2012    2.7 GHz  8GB RAM
Hi,
A while ago I partitioned my hard drive and installed Windows 7.  I use it for gaming and eventually decided I would swap my superdrive out for a SSD so Windows could run on it’s own drive.
So I now have two drives, the original Seagate Momentus XT 750GB hybrid, and a new Samsung 840 EVO SSD 1TB.  Ideally I would like Windows 7 on the SSD, in the optical drive bay and OSX on the hybrid in the primary bay.  My only reason for that position is that I believe the hybrid would be less prone to overheating in the primary bay.  However, after a bit of research I believe Windows will only boot from the primary bay so I can live with either.
So far I have managed to boot Windows (on the SSD) from the primary bay.  Works well.  It would not complete booting from the optical bay.
OSX on the hybrid (this is my original drive before this upgrade) boots fine as usual from the primary but will NOT boot from the optical bay.  I get the apple and loading wheel only.
A clone of that OSX on an old HDD will boot fine from the optical bay.  When I booted from this drive in the primary bay I can see both the SSD and the hybrid if I have them in the optical bay and system profiler reads them well.
So my first question is; does anyone have any experience or knowledge of Momentus XT’s not working in the optical bay?  I believe they had some firmware updates years ago but my drive has always ran very well until I tried it from the optical bay.
My second question is; does anyone know if it is possible to persuade my macbook pro to boot Windows from the optical drive?
Many thanks.

Well I suppose it looks like 6gb/s connection from the optical drive connection cannot be achieved on my mid 2012 model.  Would be nice to know if anyone else has achieved it...

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