It's a mistaken way of describing data, not able to all go in to the RAM at once, being temporarily stored on part of a hard drive partition until the RAM is freed up.
Do you know what turbo boost is when you plug in a flash drive on Vista? It's that.
ok, i dont think that would be necessity on a 24 GB RAM system.
and being temporarily stored on a HDD and the same being done on a SSD, surely must be hugely different !!