I'm planing to get an SSD in my next iMac, and I've read a lot on how they get slower because there's partially-filled blocks which take time to rewrite and things like this. My question is just is there something (a tool?) in order to make it as fast as it was on day 1 again? Or am I spending lots of money to have a drive slower than a normal HDD one year from now? I heard of this TRIM function but apparently it only deletes blocks, but not partially filled ones.