![]() (Hint: not in the dressing room before a gig.) And don’t rush to update – there’s nothing here that you immediately need for music work.īut in this case, if you are trying out OS X Yosemite for other reasons – or investing in a new Apple computer (the MacBook Pros are especially nicely priced at the moment) – you may be pleasantly surprised that there a few issues. Time something major like an OS update for when you’ve got time to test, and to revert if you have trouble. Backup your system before doing anything (even Apple’s Time Machine I’ve found does the job nicely). OS X Yosemite (10.10 is a major update to a desktop operating system that brings with it almost no apparent headaches for pro audio. I may even do that to go back to core storage, as Apple intended, but do not know why there was a change or if it makes a difference to performance.Here’s a welcome change. In hindsight (wonderful thing) due to really liking Yosemite and the way the MBP ran compared to Mavericks installed over Mountain Lion, I would do a Time Machine backup, create a USB bootable drive and clean install that way. Then erased the second partition and dragged the first to get back all the disk space. Source was the second and dragged the first from top left to the destination. So I restarted with the Option key held, then ended up in disk utility, then was able to restore from the second to first partition. In disk utility I tried to restore from the second to the (now erased) first partition, but it said it could not be restored and to restart in repair mode. Yosemite was the second partition and could only be “shrunk” The first partition could also be shrunk, but the space via Disk Utility is not available to the second partition. Hi Aaron, I also worked that out and yes astoundingly convoluted, but it worked. As I understand it, Apple’s Fusion Drives require Core Storage so this won’t work on those.No need to boot the recovery partition or anything. You can run this while booted into the Yosemite partition in question.The first terminal command, diskutil cs list will only work if you actually have a CoreStorage partition.For more details, check out this forum thread on MacRumors.Once that was finished, I was able to delete the Mavericks partition and resize my new Yosemite partition to fill all available space. So in this particular case, we would run: diskutil coreStorage revert 47F9D6B1-F8F2-4E64-8AD4-9F2E2BD78E29 In the same Terminal window, type: diskutil coreStorage revert You’ll need that super-long string of letters/numbers. See how it says “Revertible: Yes”? That means we can convert it back. This will give you a list of partitions similar to this: Thanks to BrettApple at the MacRumors forum for this. Open Terminal, and run this (you can copy/paste): diskutil cs list This only works if you have not encrypted the partition with FileVault.įirst, you have to get something called a lvUUID for the partition. ![]() Once I did that, Disk Utility worked fine again. You can convert Yosemite’s Core Storage partition back to HFS+. Everything was locked.įortunately, I found a solution. It wouldn’t even let me delete the Mavericks partition. So my new Yosemite install was stuck on a partition with only 10GB of free space, when it could have had 400 from the old Mavericks partition. (According to Ars Technica, there’s not a clear reason why, either.) I’m not sure of all the technical details, but this apparently killed flexibility. Some research found that Yosemite will change its partition from HFS+ to “Core Storage”. I found this out after spending a full day getting the new Yosemite partition just right. ![]() Once I’m sure that all is fine and dandy, I will go back and delete the older partition and give the space to the new one.īut when I tried this with 10.10 Yosemite, I ran into a new problem. ![]() In the past, I’ve made a new partition on my drive, installed the new OS X (like Mavericks), copied all my files from the old partition to the new one. On Macs, this has usually been fairly easy, since HFS+ partitions are pretty flexible - they’ll let you add/remove/resize without a lot of hassle. So when a new version of any OS comes out, I like to do a clean install.
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