4 Replies Latest reply: Aug 20, 2013 3:20 PM by Linc Davis
CAPT G Level 1 (0 points)

I started having Safari performance issues several months ago where accessing certain URLs (like my bank) would initiate a second Safari session and wouldn't load ultimately.  My local Genius Bar Genius couldn't determine why it was happening after an hour of help, so he created a new account on the MBA and off I went.  I couldn't load the most recent OSx update due to low HD memory and now getting messages my Startup Disk is full.  My photos, music and documents should be no more than 40Gb of the 250Gb HDD, but its showing full. 


I don't know what's being saved or by what app/program, such that it's consuming the whole HDD.  Also don't know how to manage the Startup Disk space to free any space. I'm running a Time Machine backup now.


Any help appreciated.  Thanks.

MacBook Air (13-inch Mid 2011), OS X Mountain Lion (10.8.3), 4GB RAM
  • dominic23 Level 8 (36,385 points)

    Hope this helps.


    1. Empty Trash.




    2. Delete "Recovered Messages", if any.


        Hold the option key down and click "Go" menu in the Finder menu bar.


        Select "Library" from the dropdown.


        Library > Mail > V2 > Mailboxes

        Delete "Recovered Messages", if any.

        Empty Trash. Restart.



    3. Repair Disk


        Steps 1 through 7




    4. For more on this and very helpful tips:





    5. Disk space / Time Machine ?/ Local Snapshots







    6. Re-index Macintosh HD


       System Preferences > Spotlight > Privacy






  • Old Toad Level 10 (133,355 points)

    Download and use the free GrandPerspective to see what's taking up so much of your HD space.


    Have you downloaded and installed any 3rd party apps just prior to this issue appearing?



  • babowa Level 7 (29,095 points)

    See the info here (especially the part about local snapshots):




    and here:



  • Linc Davis Level 10 (184,705 points)

    Empty the Trash if you haven't already done so. If you use iPhoto, empty its internal Trash first:


    iPhoto Empty Trash


    Then reboot. That will temporarily free up some space.


    According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation. You also need enough space left over to allow for growth of your data. There is little or no performance advantage to having more available space than the minimum Apple recommends. Available storage space that you'll never use is wasted space.


    If you're using Time Machine to back up a portable Mac, some of the free space will be used to make local snapshots, which are backup copies of files you've recently deleted. The space occupied by local snapshots is reported as available by the Finder, and should be considered as such. In the Storage display of System Information, local snapshots are shown as "Backups." The snapshots are automatically deleted when they expire or when free space falls below a certain level. You ordinarily don't need to, and should not, delete local snapshots yourself.


    To locate large files, you can use Spotlight. That method may not find large folders that contain a lot of small files.


    You can more effectively use a tool such as OmniDiskSweeper (ODS) to explore your volume and find out what's taking up the space. You can also delete files with it, but don't do that unless you're sure that you know what you're deleting and that all data is safely backed up. That means you have multiple backups, not just one.


    Deleting files inside an iPhoto or Aperture library will corrupt the library. Any changes to a photo library must be made from within the application that created it. The same goes for Mail files.


    Proceed further only if the problem isn't solved by the above steps.


    ODS can't see the whole filesystem when you run it just by double-clicking; it only sees files that you have permission to read. To see everything, you have to run it as root.


    Back up all data now.


    Install ODS in the Applications folder as usual. Quit it if it's running.


    Triple-click the line of text below on this page to select it, then copy the selected text to the Clipboard (command-C):

    sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper

    Launch the Terminal application in any of the following ways:


    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)


    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.


    ☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.


    Paste into the Terminal window (command-V). You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.


    The application window will open, eventually showing all files in all folders. It may take some minutes for ODS to list all the files.


    I don't recommend that you make a habit of doing this. Don't delete anything while running ODS as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means. When in doubt, leave it alone or ask for guidance.


    When you're done with ODS, quit it and also quit Terminal.