I just ran the free Disk Inventory X app to show me what all is on my hard drive. 10 GB (!) is two iNode files in a hidden "Lost+Found" folder. They're stored as TextEdit documents (iNode32137092 and iNode 19210586, to be exact), from October 2013 and July 2012, respectively.
I Googled a bit to an Apple support thread that suggested they may be leftover from previous OSX installs.
But as they're hidden, I didn't want to take the chance, and I couldn't find a Disk Image app or anything like that (which was also recommended on some other forum) to confirm.
Anyone here have any ideas if I can safely delete these to free up the space? Or know how/where I could find more info?
Those two dates on the files, by the way, correspond exactly to release dates of Mountain Lion and Mavericks, so I'm thinking I might be safe in deleting them, but wanted to ask some trusted experts here first!