Booting settings for 2nd hdd caddy

Oct 2, 2018
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Dear Concern,
I have install a Samsung ssd 512gb as primary hdd and Toshiba 320 gb 7200rpm hdd in optical bay caddy. And my system working very smoothly. But when I interchange between two means when I use 320 as primary hdd and ssd in optical bay caddy. System don't booting up. Is any solution for it.