Just recently I'm showing that I've lost a very large amount of disc space for no apparent reason?

I have 750GB MacBook Pro and up until the other day I showed 250GB used and 500GB unused.  I discovered this because the past two days my computer would just freeze and I couldn't do anything.  So I ran the Disc Utility and it found some errors and fixed them.  So I'm wondering if the 400GB of lost disc space now has something to do with the computer locking up? I've searched all the folders and added up their size and still come back to 250GB that I can see.  So I'm assuming there's something hidden somewhere that's eating up over half my hard disc space?  HELP!

BNK12 wrote:
So somewhere I have between 450 - 500 GB's taking up my disk space?
Yes, exactly. The total used, per the sidebar, is 735 GB, but the total at the top is 269 GB, leaving 466 GB unaccounted-for.  As mentioned in the Other large files section of the Where did my Disk Space go? article, the similar free apps don't show things the logged-on user isn't permitted to see. Unfortunately, the version of WhatSize on the AppStore doesn't, either. A few of those are detailed in the green box.
First, have you Verified your internal HD, per the link in the yellow box at the top of the article?  If not, do so.  If that doesn't say your disk "appears to be ok," follow the instructions there to start from your Recovery HD and Repair it, then have WhatSize re-measure your drive.
If that doesn't help, do you have more than one user account (besides the 230 GB bkundinger)?  If so, log on to the other(s), use WhatSize to see how large those home folders are, and add them to the 269 GB total.
If not, or if that doesn't explain the difference, you need to be able to see everything.  Probably the best way to do that is with the version of WhatSize that you get directly from the vendor -- just click the link in the green box or go to http://whatsizemac.com.  That version has the "As Admin" icon in the toolbar, per the sample in the green box.  Click it and enter your Admin password, then have it re-measure your internal HD.
That will take a few moments, of course, but the resulting display should show everything, including the missing 466 GBs.  As noted, don't delete anything you don't understand; if in doubt, post the new screenshot here.

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