Directing planetside to critical files on a Virtual Drive?

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I'm thinking about setting up a vitual drive through ym RAM so that i can load PS faster. I am thinking about going about doing this by putting critical files that need to be ploaded quick, or maybe even the whole directory(another story), onto this virtual drive.

So if i put just critical files onto this VD, how would i tell my planetside directory to look in that drive?