macOS 27, “Golden Gate,” effectively breaks support for CoreStorage volumes, including encrypted HFS+ disks. Unlike macOS 15, which had inconsistent problems but generally allowed access, the new version’s standard tools cannot mount, convert, or erase these volumes. Disk Utility reports an obscure dismount error; `diskutil` may claim a volume is locked even when CoreStorage shows it as unlocked. The system can still read a volume if it is mounted manually with the low-level `mount_hfs` command, but only read-only: attempts to mount read-write or erase the disk fail with “Resource busy.” Conversion from HFS+ to APFS also fails. A boot-time warning compounds the confusion by saying support will end in macOS 28, although the described failures occur in version 27.
The only workable route found for reclaiming the disk is a partial deletion followed by a restart. Running `diskutil cs delete` on the logical volume group fails to finish because the erase step encounters the busy error, but it does remove the logical volumes and leaves the group offline. After rebooting, the physical volume can be erased. This is a destructive recovery, not a way to preserve or convert the data: no method was found to restore normal access or convert the existing volumes in place. The author ultimately rebuilt the disks from backups and asks readers to share better recovery methods, emphasizing the risk to anyone relying on older encrypted HFS+ storage.
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