Have a read of
this thread in the Apple Forums about the .MobileBackups. I got the wording wrong, as they are Local Snapshots not a swapfile, but you will need to show Hidden Files to be able to see it.
You can do this with the Daisy Disk App, if you scan as Administrator, but you need to pay the $9.99 to do this.
BUT, you can do this in Terminal by copy and pasting this in and hit return :
Code:
defaults write com.apple.finder AppleShowAllFiles YES
then type in
and hit return.
The first line lets all the hidden files on your Mac visible and the second one, relaunches Finder, and you need to do that to let the files be shown.
.MobileBackups will then be in /Volumes and you will have to Right Click or ⌃Click (control click) to bring up the Contextual Menu and Put it in the Trash.
Remember once its there, you will have to empty Trash to get the HD Space back.
Once done, reverse the hidden files by
Code:
defaults write com.apple.finder AppleShowAllFiles NO
Return and
Return
HTH some, but really first, you need to work out, IF there is these .MobileBackups doing the Space Hogging, and to do this, you need a App like Daisy Disk, that will allow you to scan as a Administrator so you can see the Hidden Files. To be honest, for the price of 2 coffees, Daisy Disk is worth its weight in Gold. It has saved me so much time, and headaches, because with the Paid version, you can see the Hidden Files, and Delete them from the App, without having to try and find them yourself.
There are others out there, and have tried others, but DD, is the one I came back too
Good luck.