ready boost on memory stick?

OMB!

New member
my memory stick only has 1% of it's memory free so i looked to see what was on it and i deleted loads of this and it didn't really make a difference, then i saw this thing called ready boost cache file on my memory stick and it's taking up 3.26 MB! which is much more than anything else on there, do i need it, i mean to open and save things and stuff or is it just sitting there taking up loads of room. what does it do, and can i delete it?
 
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