well you guys are full of obvious info...i know lion takes up space and i also wasn't expecting 512 available. my concern was that 25 gigs was already used...that is more then system files take up. come to find out its 16 gigs worth of sleep images...
Apple must be using non-standard reporting as well (although erroring in the favor of the consumer). You expect about a 7% drop from the advertised decimal (GB) to the reported binary (GiB) storage. I would have expected around 475GiB of storage on an advertised 512GB HDD or SSD.
After that you expect the free space to drop lower because you are storing your OS in it.
well just for people who are interested following the tuaw.com to turning safe sleep off and clearing the image worked great...saved me 16gigs
Not sure I would ever want to turn Safe Sleep offnot even for 16 gigs.
read the article and i think you might change your mind...
http://www.tuaw.com/2011/08/22/why-hibernate-or-safe-sleep-mode-is-no-longer-necessary-in-os/