The system barrier impacts standard graphical interfaces and command-line management utilities, blocking native conversions directly to APFS. Disk Utility reports error 49,153 during mount tasks, while typical disk management tools trigger locked-volume or busy-resource alerts when users attempt to alter logical volume groups. Users requiring file access must bypass normal utilities by employing the low-level `mount_hfs` command to set up read-only directories.
Key points
Native utilities in macOS 27 cannot convert CoreStorage volumes directly into the modern…: Native utilities in macOS 27 cannot convert CoreStorage volumes directly into the modern APFS format.
Administrators can achieve read-only data access by manually invoking the low-level `moun…: Administrators can achieve read-only data access by manually invoking the low-level `mount_hfs` command.
Deleting logical volume groups via the command line triggers formatter errors while still…: Deleting logical volume groups via the command line triggers formatter errors while still partially removing internal volumes.
Sources checked by our analysis pipeline: 1
macOS 15 Sequoia had a hard time with CoreStorage – and thus encrypted HFS+ volumes – since it deprecated both technologies and callously crippled some important tools for working with them, but nonetheless it mostly still worked. While I’d often – but not always – have to manually unlock one of my HFS+ volumes – but not the others – at boot, and it also refused to convert some – but not all – volumes from HFS+ to APFS1, keeping me trapped in the situation – it ultimately still worked. I could get at my data and use the volumes more or less normally.
Unfortunately, in macOS 27 that’s no longer the case. Not only does Golden Gate just not support CoreStorage / encrypted HFS+ volumes, out of the box you can’t do anything with them – can’t mount them, can’t convert them to APFS, can’t even erase them. It renders your expensive storage hardware completely useless.
Worse, macOS 27 puts up a misleading dialog, upon boot, saying that macOS 28 (the next version) won’t support these volumes. I have…
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