Question about partitions on Mac

Discussion in 'OS X Yosemite (10.10)' started by Falcon9, Jul 10, 2015.

  1. Falcon9 macrumors member

    Falcon9

    Joined:
    Jun 17, 2015
    Location:
    Eastern Canada
    #1
    Hello,

    I'm considering installing the El Captain public beta onto a secondary partition on my rMBP 2015 running 10.10.4. I have the base model with 128GB of storage (which is more then enough for my needs, as I store any large files I don't use regularly on an external 500GB hard drive that I also use as a Time Machine backup). Currently (according to the Finder) I have 62.29 GB of free space available on my computer. However when I go to create a secondary partition the largest it will let me make it is 42.79GB. Does Apple put a limit on to how large one can make a secondary partition? From what I've heard people recommend at least 30GB for running the beta software (which is what I'm planing to do, since I don't intend to use it as a primary OS) so basically I just want to make sure I'm not limiting the amount of storage available on my main partition by more then I think I am.

    Thanks.
     
  2. Fishrrman macrumors G3

    Joined:
    Feb 20, 2009
    #2
    "However when I go to create a secondary partition the largest it will let me make it is 42.79GB. Does Apple put a limit on to how large one can make a secondary partition?"

    I'm going to -guess- that "the limit" is created by Disk Utility, based upon the amount of "used space" it "sees". Remember that a certain amount of free space is necessary in a partition that contains the OS to handle swap files, temp files, etc.

    Having said that, you shouldn't have any trouble installing ElCap into a partition that is 42gb in size -- the installation itself is probably around 8-10gb.

    BUT -- I would advise you to consider doing your "experimental install" to a totally separate DRIVE, rather than a partition. I just believe it's better to keep some "extra separation" between the install of an experimental copy of the OS, and the "working copy" that you depend on day-to-day.

    How many posts have you already seen here, where a user has installed a pre-release copy of the OS, has had problems, and is then wondering and asking, "how do I get back to where I was before?" ...?
     
  3. kohlson macrumors 6502a

    Joined:
    Apr 23, 2010
    #3
    There are other partitions, you just can't readily see them. There is a recovery partition and a swap partition. And Time Machine create a hidden file to do "local backups."
     

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