macOS 27 does not support CoreStorage volumes
colejohnson66
126 points
87 comments
November 03, 2026
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Discussion Highlights (8 comments)
throwaway27448
For those of you who have never heard of this, it's macos's LVM. Why they didn't just refer to it as LVM is beyond me.
exabrial
MacOs 27 is a disaster. All of the sudden, I have 35% of a computer left to do any kind of work.
hmartin
Also dropped support for FireWire drives, as I just found out the hard way.
varispeed
I upgraded and this system is a dumpster fire. Lags, random crashes, performance issues, random CPU spikes...
Marsymars
Well, heck. I posted ~7 months ago about my decision to use HFS+ for backups, and had a couple skeptical replies. ( https://news.ycombinator.com/item?id=47317123 ) I guess I misjudged Apple's commitment to support HFS+ long-term. It now seems like there's no real native way of doing encrypted backups to HDDs on macOS (APFS not really recommended for HDDs)... the options are either encrypted Time Machine to a network location, or a third-party tool. Guess I'll figure out SuperDuper or Carbon Copy.
whatever1
Why do people try to force macOS things that it does not like to do? macOS does not like not apple hardware, period. For backups use a NAS. You can find from completely plug and play options to bring your own machine ones.
someonehere
With macOS 27, I don't know who Apple is trying to outdo?. 27 has been a total disaster for me and my setup at home. Back when there was a little more rivalry between Microsoft and Apple, Apple would come up with these really cool things to showcase the operating system and make lives easier. Now, I don't know what it is they're trying to prove with this operating system. I also hate the fact that they skinned the whole operating system around a failed hardware product.
AceJohnny2
FWIW, this is listed as deprecated in the Release Notes: https://developer.apple.com/documentation/macos-release-note... (Search for CoreStorage; their fragment links are hilariously broken) The premier 3rd Party technical blog Eclectic Light talked about it in June: https://eclecticlight.co/2026/06/17/what-to-do-with-your-enc... I can't immediately find prior warnings that this was coming. The following technical note from July 22nd says Encrypted HFS+ Volumes won't be supported in macOS *28* , so this seems a bit early... https://support.apple.com/en-us/125615