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Will reinstalling Mac OS X Mountain Lion wipe my Hard Drive?

3483 Views 4 Replies Latest reply: Nov 15, 2012 2:47 AM by woodmeister50 RSS
Iamawesome997 Level 1 Level 1 (0 points)
Currently Being Moderated
Nov 14, 2012 12:54 AM

I want to reinstall Mac OS X Mountain Lion on my MacBook Pro 2012. I have many apps and files on my Mac's hard drive and I was wondering what would happen to them if I were to reinstall Mountain Lion.

MacBook Pro, OS X Mountain Lion (10.8.2)
  • actionmarker Level 3 Level 3 (875 points)

    Reinstall will not wipe your data or installed applications, it will only install the OS files.


    However as a standard precaution, you should backup your data before you reinstall, for the 'just in case' senario.


    I would be asking first, what is the reason that you want to reinstall the OS, and what issue are you trying to resolve.

  • actionmarker Level 3 Level 3 (875 points)

    That's cool, but just remember, that depending on a computer and it's configuration, application load times etc all run a little differently. (SSD drives are much faster at loading applications than traditional HDDs. Also, if you hard drive is quite full, it can run slower.)


    Before I would proceed with a full reinstall the OS, I would run Disk Utility in the Applications/Utilities folder and repair disk permissions.


    To do so, I would reboot my computer, make sure no applications are running, run DU, reboot again and then see if the performance has improved.


    Screen Shot 2012-11-15 at 5.24.22 PM.jpg

  • woodmeister50 Level 4 Level 4 (3,690 points)

    If things seem to be running slow, open up activity monitor

    and set the dropdown menu to Show All Processes.  Then

    click the CPU column title to sort for desending CPU usage

    and see if there is some app using lots of CPU.


    In Activity Monitor, you can also check disk activity and network

    activity to see if there is something excessive going on there.


    Also, if you have any antivirus app installed and running turn it off.

    These are notorious for creating system slow downs.  If you really

    want an antivirus app, turn off background operation and only

    run if you suspect an issue.


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