How to Connect 3 Hard Drives To Motherboard At The Same Time

I have 3 Hard drives 2 attached with my comp. 1st master second slave 3rd not attached but has OS on it I use this 3rd HD to test new software. Now is there a way for me to attach all 3 drives at the same time so I do not have to open my case to disconnect the ribbon wire, and unplug their molex power cables? I want a tool or cable to solv the problem since i can only attach 2 HDDs at a time since my motherboard has 2 ports for HDD. I dont want to lose hard drive speeds by using such a new cable either so please let me know.
& how can I set up my pc to choose which OS or hard drive to boot from?

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