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I got Yosemite via the Apple Beta Program. I installed Yosemite on a separate partition which I had created for the purpose specifically. Now I want to reclaim my 50 GB by deleting the partition. I have already set my startup disk to my original Mavericks partition.

So, if I launch Disk utility in Mavericks and delete the Yosemite partition, will my Mac still boot?

PS: I am not looking to uninstall just yet, but I'm running low on space and might need to get some space back soon enough (before Yosemite gets stable and I get the upgrade).

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There is no uninstall per-se for any OS X installation.

You can just boot into your other OS to test that it boots before deleting your current OS partition. I can't speak to any changes that Yosemite has made to your Mac or the recovery partition, but I'd start with powering it off and then booting while holding the option key. From that boot manager, you can test that your Mavericks partition is working and then decide to delete the other partition(s) or if you need to fix things before getting to a point where you have no bootable volumes. In fact, you can't self delete a running partition so you'll likely have to boot to Mavericks (or Recovery HD) to delete a new install as you have done.

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  • I guess it does the changes on the EFI for selecting the boot disk? So if I delete the Yosemite partition from Mavericks and set Mavericks for startup disk then it should boot, right?
    – Vaibhav Kaushal
    Commented Aug 1, 2014 at 19:21

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