Splitting System Files Across Multiple Hard Drives

Hey, all:
I was thinking about taking adavantage of Other World Computing's program to add a secondary SSD to my 2010 iMac. My plan was to add a 240GB SSD and copy the System, Application, and Library folders to the SSD. I was planning on leaving the Users folder on the stock HD.
It occured to me that this could possibly confuse the system, as maybe OS X needs to see all four of those folders on the same HD. Is this something I should be worried about, or am I just loopy from being outstide in the cold?
TIA for any help.

Mattand wrote:
Hey, Varjak:
Now I'm wondering if I should just get a SSD big enough to hold everything. I wonder if any speed gains would be negated, as the system would have to bounce back and forth between the regular HD and SSD for the system prefs in the Home folder.
It depends on exactly how the system will be operating, but I'd expect a significant speedup if the OS and applications are on an SSD even if all the user files are on a hard drive. The time to read preference files is negligible, so that shouldn't be a concern, though application support files are a bit more extensive and take a bit longer to access depending on the app. You should still see significant improvement even so, though you might consider keeping your home folder on the SSD and moving just your documents and other data to a hard drive. You may also want to check your iMac's HD and if it's the normal 5400-RPM unit upgrade it to a higher-performing 7200-RPM unit.
Regards.

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