Create two Mountain Lion partitions?

Discussion in 'MacBook Air' started by mactipple, Oct 15, 2012.

  1. mactipple, Oct 15, 2012
    Last edited: Oct 15, 2012

    mactipple macrumors newbie

    mactipple

    Joined:
    Oct 15, 2012
    Location:
    UK
    #1
    I have a 2012 Macbook Air, currently running the latest Mountain Lion release. Is it possible to create a second partition that also runs Mountain Lion? The reason I want to do this is so that I can test software without messing around with my main primary partition.

    I created a second partition using disk utility but when I tried to select it to install Mountain Lion (after rebooting and pressing command R) it just said that the disk cannot be used.

    Any ideas?
     
  2. Lunfai macrumors 65816

    Lunfai

    Joined:
    Nov 21, 2010
    Location:
    Sheffield
    #2
    You can install it on an external hard drive, this is the best way, since you won't need to mess around with the ssd drive. It might not be letting you split it because its being used, even if there's enough free space to split it.

    You could install it on a fast sd card or thumb drive too. :)
     
  3. mactipple thread starter macrumors newbie

    mactipple

    Joined:
    Oct 15, 2012
    Location:
    UK
    #3
    Thanks. Yes, I have considered installing on an external drive but I'm trying to have as few things sprouting from my laptop especially when on the go.

    Actually I was able to create a new partition without any problems, the problem happened when I tried to select the new partition to install the os. I'm wondering if installing from a USB key with Mountain Lion on it would make a difference?
     
  4. ixodes macrumors 601

    ixodes

    Joined:
    Jan 11, 2012
    Location:
    Pacific Coast, USA
    #4
    I use this solution (SanDisk) it's fast and very portable.
     
  5. Lunfai macrumors 65816

    Lunfai

    Joined:
    Nov 21, 2010
    Location:
    Sheffield
    #5
    Yes I would give the USB key method a try, maybe it's not liking the fact that you're trying to install it again on another partition on the same drive.

    These SD cards are perfect for the job, and hook up one of these:

    One of these: http://item.mobileweb.ebay.co.uk/viewitem?itemId=300768465717&siteId=3&isClassified=false
    And this: http://theniftyminidrive.com/
     
  6. TheRichboy247 macrumors member

    Joined:
    Oct 7, 2012
    #6
    How is the partition formatted? Did you use Mac OS Extended (Journaled)? You also have to use the GUID Partition Table. Try that and see how it goes.
     
  7. mactipple thread starter macrumors newbie

    mactipple

    Joined:
    Oct 15, 2012
    Location:
    UK
    #7
    Hadn't heard of the mini drive, something like that looks perfect for extra storage on the Air, although it looks like it won't be out until December.

    ----------

    Yep, both partitions were set as Mac OS Exended (Journaled) and GUID.
     

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