I have a 30 gb ssd and trying to reduce storage of stuff I don't need to where possible,moving all that can be moved to an external drive.My motherboard doesn't support ACHI which is needed for TRIM I believe,any suggestions .I see that some of these eraser or wipers paste over or overwrite the deleted portion with 0 and 1 which indicates the space is being used.Is there some feature out there that would suit my needs.