Is it posssible to use a partition on my HDD for readyboost?
I have a stupid partition called system reserved and on readyboost tab, it says i cannot use it because it has to be bigger than 256mb.OK, So I created a 2gb partition, but this option is not available,why?
No. ReadyBoost is for flash drives (using the advantage of quick file access times that flash drives provide) and is intended for systems with lower amounts (2GB or less) of ram. Get a decent sized (2GB - 4GB) flash drive if you need to use ReadyBoost. If your computer has more than 2GB of ram, don't even bother with ReadyBoost, as you will see very little to absolutely no performance benefit from it.
Better yet, buy more ram. It's relatively cheap, and provides a much better performance benefit than ReadyBoost will.