4 Replies Latest reply: Nov 15, 2012 2:47 AM by woodmeister50
Iamawesome997 Level 1 Level 1 (0 points)

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)
  • 1. Re: Will reinstalling Mac OS X Mountain Lion wipe my Hard Drive?
    actionmarker Level 4 Level 4 (1,110 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.

  • 2. Re: Will reinstalling Mac OS X Mountain Lion wipe my Hard Drive?
    Iamawesome997 Level 1 Level 1 (0 points)

    I just want to reinstall Mac OS X 10.8 Mountain Lion because some apps (Safari, Mac App Store etc...) took quite some time to load every time I opened them.

     

    ****Back story******

     

    A few days ago, I went to my local Apple Authorised Reseller and saw that the entry level MacBook Pro that they had on display loaded Safari and many other apps really quickly. I wondered why this was so, when mine took longer to load. I asked them if they had altered it or something, and they said that they hadn't upgraded it and that it was in factory condition. I told them about my problem and they said it might be a glitch in the software while I downloaded the upgrade. So this is why I want to reinstall Mountain Lion.

  • 3. Re: Will reinstalling Mac OS X Mountain Lion wipe my Hard Drive?
    actionmarker Level 4 Level 4 (1,110 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

  • 4. Re: Will reinstalling Mac OS X Mountain Lion wipe my Hard Drive?
    woodmeister50 Level 4 Level 4 (3,745 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.