Clean install to a new partition.

Discussion in 'OS X Yosemite (10.10)' started by Noldat, Oct 17, 2014.

  1. Noldat macrumors newbie

    Sep 18, 2014
    Hello all,

    Quick question, for the Beta I created a second partition on my main drive to install Yosemite so I could come back to Mav when I encountered problems. I see lots of people saying the way to do a clean install is use a bootable usb drive and install over Mav.

    So my questions are
    1. Can I do the install the same way I did before (a separate partition) and if so what are the downsides.
    2. Can I then just reclaim the space from the Mav partition once i'm satisfied?

    Thanks in advance.

  2. 128keaton macrumors 68020


    Jan 13, 2013
  3. Noldat thread starter macrumors newbie

    Sep 18, 2014
    Fantastic this seems like the easiest method if you have the space on your main ssd/hd. What about applications can i just copy them over? Is this a bad idea?

  4. Noldat thread starter macrumors newbie

    Sep 18, 2014
    So I did what i thought was right and i am faced with a dilemma.

    I have a 256GB SSD that had a Mavericks partition and a Yosemite partition. After i installed and was happy with the Yosemite partition i deleted the Mav part and expected to be able to add it to the Yosemite part. I can not figure out how to grow the Yosemite partition my window looks like this.

    Attached Files:

  5. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    You can't expand up.

    Here is what you do. Make a new partition on the top and format. Call it what you want... say New Yosemite. Now do a command-r boot to recovery and from the start Disk Util. Go to the restore tab and drag the old Yosemite volume into the source field and New Yosemite into the destination field then click restore. This will move the Yosemite install to the new (top) partition.

    Now restart and hold the option key to select the New Yosemite volume to boot from. After making sure all is well, use Disk Util to remove the old Yosemite (bottom) partition then expand the New Yosemite partition into the now empty space.

    Give this a look.
  6. Noldat thread starter macrumors newbie

    Sep 18, 2014
    Thanks for the info I am going to try this when I get home tonight.
  7. Noldat thread starter macrumors newbie

    Sep 18, 2014
  8. TitanTiger macrumors 6502

    Jun 8, 2009
    I've seen different opinions on this and I wanted to see if anyone had some more detailed insight.

    I'd like to do a fresh install to get rid of old preferences files that may be corrupted. But some stuff would be easier if I could use migration assistant afterward, such as the Keychain, bookmarks, email accounts and so on. I'm just wondering, what sorts of things can I use Migration Assistant for without making a clean install pointless? Can I import Applications, or will that pull in bad preference files with it?

    Does anyone have good knowledge of exactly what comes over doing that?

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