SSDs for FSX

I'm running FSX on a 500GB Toshiba Hard Drive and I have my MegaScenery on a 2TB Toshiba Hard Drive. I am considering going to a Solid State Drive to decrease the long load times. I don't know if I need to change both drives to SSD or only one of them. Could someone advise me?

Jerry

Both would help
- fsx drive: faster start up
- scenery drive: better Performance in flight

Thanks Michael, I will at least replace my FSX drive with a SSD.

Jerry