I think it may differ between the models. Ive only seen the raid bios once on that laptop before i changed the Liteon disk with a 250GB Intel. I you need to upgrade your drive it should be pretty strait forward. The only reason we needed a type of raid on these laptops was because of the back to back SSD unique to these Acer laptops as far as i know. Regarding you free space issue. Try and download "treesize free" and check if there arent any hidden directories containing data. Make sure you untick hide hidden files and folders under your windows folder options. And just a stab in the dark but could it be that the SSD is just terribly worn down?
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