1. iMore Question's Avatar
    If I have Snow Leopard and Yosemite on separate partitions and then restart the computer, how does it know which OS I want to use?

    What happened is this: Snow Leopard will not run this year's Turbo-tax so I need the newer OS system but I prefer Snow Leopard for most purposes. Not sure what problems I might be introducing if I download Yosemite onto a separate partition. I haven't needed to partition before.

    Model Name: MacBook Pro
    Model Identifier: MacBookPro5,1
    Processor Name: Intel Core 2 Duo
    Processor Speed: 2.93 GHz
    Number Of Processors: 1
    Total Number Of Cores: 2
    L2 Cache: 6 MB
    Memory: 4 GB
    02-07-2015 02:59 PM
  2. kch50428's Avatar
    02-07-2015 03:36 PM
  3. warcraftWidow's Avatar
    No. He's wondering about two different OS X partitions.

    I'm not sure which would start up by default.
    02-07-2015 05:11 PM
  4. Beyond Fire's Avatar
    Well I'm not sure if it would be different on Mac but when I installed Linux on my win 7 machine every time I restart my comp it would ask me what OS I would like to boot into.

    I imagine you would get the option to choose on a Mac as wellbut I'm not 100% since I haven't installed another separate partition on my rMBP.

    Sent from my Golden Apple Six
    02-07-2015 05:54 PM
  5. iEd's Avatar
    I ran my iMac like this for years. It will boot up with the last OS used. If you hold option while the computer is starting up you'll get a choice of which to use. After that it will boot in that OS or while in any OS go to system preferences startup disk click that and you can choose from there.

    Sent from my iPhone using Tapatalk
    kch50428 likes this.
    02-07-2015 07:10 PM

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