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  • 1 Post By njlx2016
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    MicheleSamaja's Avatar
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    Default Partitioning hard disk in a Mac with Sierra

    I am trying to partition the hard disk to accommodate an older MacOs version that can run only when needed. I used the Disk Utility and all went smooth until pressing the Apply button. After a few minutes, when "shrinking file system", the Mac stops and restarts, of course without creating the new volume. Do you now how to handle this? Thanks!
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    Bazza1's Avatar
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    Default Re: Partitioning hard disk in a Mac with Sierra

    Is it even possible to partition the Mac's drive these days? I mean, beyond the virtual partitions created by products like Parallels. Its been years since I even considered that sort of thing - and now, with an MBA with a factory SSD, size would preclude it.
    I did partition an external drive with my MBA - half for Time Machine and half for misc storage - and that went off without issue. I don't suppose the older OS would run off an external drive?
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    njlx2016's Avatar
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    Default Re: Partitioning hard disk in a Mac with Sierra

    It is possible to install and run Mac OS from an external drive.

    If the older Mac OS installation is only going to be used occasionally, I would suggest looking into installing it on a fast external drive - ideally an SSD with at least a Thunderbolt connection if you Mac supports it.

    I have briefly used this type of setup in the past and the speed differences vs an internal drive are negligible.
    Bazza1 likes this.
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    Tech198's Avatar
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    Default Re: Partitioning hard disk in a Mac with Sierra

    Try booting to recovery and shrink disk as needed...... I do know Disk Utility has it's 'quirks' when the OS is running.. For some reason Apple change how these are interconnected...

    a.k.a he same thing happens as how u are unable to verify or repiart he boot drive for permissions, but u can outside the OS... even for external drives...For reason still unknown now in Sierra Apple cooperates first aid into a single button, completely obfuscating the repiar case.

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