Technically, in the case of this machines infrastructure what you are purporting to do is use the equivalent of a floppy disk for "ram".
The SD card is the SLOWEST device on the phone, and getting data on/off it one of the more intensive tasks the little bugger has to do. If we tried to use that to extend the "ram" of you're phone you would be degrading the phone beyond the point of "unuseable".
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