7 Replies Latest reply: May 18, 2012 7:32 AM by WZZZ
hadialqadi Level 1 Level 1 (0 points)

Hi, can you tell me how to repair system files without formatting my hard disk, thanks.

  • WZZZ Level 6 Level 6 (12,640 points)

    Boot from the Install disc and run Disk Utility>Repair Disk.

  • FatMac>MacPro Level 4 Level 4 (3,290 points)

    hadialqadi wrote:


    Hi, can you tell me how to repair system files without formatting my hard disk, thanks.

    If you want to repair system files rather than the hard disk directory, download the 10.6.8 combo updater here: http://support.apple.com/kb/DL1399, boot into safe mode and run the update. But before you do that, what makes you think any system files need repair?

  • WZZZ Level 6 Level 6 (12,640 points)

    Applying the 10.6.8 Combo is going to be pretty much hit or miss. If this is really necessary, the best way to proceed would be to reinstall Snow Leopard, using the install DVD, choosing the install (not erase and install) option, which will give new system files as of the point version on the DVD, while preserving data and third-party. Then update using Software Update or the link to the Combo, above.


    But yes, why is this being requested?

  • R C-R Level 6 Level 6 (14,920 points)

    Just a slight footnote to WZZZ's comments: there is no "erase and install" option in the Snow Leopard installer (nor is there an 'archive & install' one). Running the SL installer on a volume that already has SL installed will work as described, replacing only the system files.

  • ds store Level 7 Level 7 (30,315 points)

    hadialqadi wrote:


    Hi, can you tell me how to repair system files without formatting my hard disk, thanks.


    Yes, I've outlined the process in Step #18 Reinstall Just OS X


    Step by Step to fix your Mac


    However you might want to review the earlier steps as this might not be necessary, as you haven't fully descibed why you wish to do this.


    If you elaborate what your problem is, we might be able to recommned a closer or more correct solution

  • hadialqadi Level 1 Level 1 (0 points)

    I want to repair my sytem files because my mac startup and the mac itself are slow.

  • WZZZ Level 6 Level 6 (12,640 points)

    Your system files don't need to be "repaired."


    One good generic troubleshooting step for this is to run Applejack. It is known to sometimes help with slowdowns.






    Article on using:




    Be sure to run the underlined below, as well


    It runs in single user mode, where it runs more safely than other maintenance/cleaning programs because there is less chance of interference from the OS. After installing (you won't see it in the Applications Folder) hold CMD-S at startup. You will get a black screen with MS-DOS like text. Just follow the prompts: type in "applejack AUTO" and it will run through the following:


    Correct any Disk problems.

    Repair Permissions.

    Clear out Cache Files.

    Repair/check several plist files.

    Dump the VM files for a fresh start.

    Trash old Log files.


    You can also run tasks selectively and for specific users by typing in "applejack." After running in "AUTO,"  you can go back and run it again as "applejack," steps 3 & 4 only, for your user.


    The first reboot will take much longer than usual, as it rebuilds caches. It may take several restarts to see the benefits. Because of the deep cache cleaning in AUTO mode some applications may tell you they are being opened for the first time.


    NOT YET UPDATED FOR LION (although it is reported by some that it is working)




    (Adapted from post by BDAqua)