[all variants] Power Switch for Internal Hard Drives - Security Precaution

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http://ubuntuforums.org – We have all seen dual boot arrangements and such but I am interested in the extra security that a physical separation of hard drives would provide. I am curious why I have never seen switches on (power or data) cables for internal drives. I would like to install two separate hard drives in my computer with one operating system loaded on one (say with my sensitive data) and another drive with a separate operating system loaded on it (say for email and browsing the internet). (On occasion I could turn them both on to transfer select information.) I could load an alternate operating system on an external drive but I would still like the option of turning off the internal drive with all of my sensitive information. Plus, I dont like the clutter of extra "stuff". Has anyone done this before? Where did you put the switch: power or SATA cable? If you put the switch in the power cable where did you put it: there are two power (colored) and two ground (black) wires? I have heard in the past that this kind of arrangement could fry your computer but the way we hot swap external hard drives I find it hard to believe. Am I wrong? (Hardware)