● Covered by 1 source · 1 reportMedium impact1 negative
macOS 27 Removes Support for CoreStorage and Encrypted HFS+ Volumes
Key points
- macOS 27 does not support CoreStorage/encrypted HFS+ volumes.
- Users cannot mount, convert, or erase these volumes.
- Disk Utility and diskutil commands fail with errors.
- A misleading dialog states macOS 28 will drop support.
Loss of CoreStorage Support in macOS 27
macOS 27, known as Golden Gate, has completely removed support for CoreStorage and encrypted HFS+ volumes. This means that any storage hardware formatted with these technologies becomes unusable, as the operating system cannot mount, convert to APFS, or even erase them. This is a significant departure from macOS 15 Sequoia, which, despite deprecating these technologies, still allowed for some functionality and data access.
Impact on Existing Storage
Users with CoreStorage or encrypted HFS+ volumes will find their data inaccessible and their storage devices rendered useless under macOS 27. Attempts to mount these volumes through Disk Utility result in a 'com.apple.DiskManagement.disenter error 49,153' error. The 'diskutil mount' command also fails, providing an incorrect message that the volume is locked, even when it is already unlocked.
Misleading User Notifications
Upon booting macOS 27, users are presented with a dialog box incorrectly stating that macOS 28 will be the version to drop support for these volumes. This discrepancy suggests a potential miscommunication or error within Apple's development process regarding the timing of this significant change.
Technical Details of Failure
Even when a CoreStorage Logical Volume is confirmed as unlocked and attached, macOS 27 fails to recognize or interact with it. Commands like 'diskutil cs unlockVolume' confirm the volume's unlocked status, yet subsequent attempts to mount or manage it through standard tools are unsuccessful, indicating a fundamental lack of support within the new OS version.
✨ This summary was generated by AI from the outlets' reporting listed below. It is not independently verified and may contain errors — check the original sources. How BrevFeed works →
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Reporting from
macOS 27, codenamed Golden Gate, no longer supports CoreStorage or encrypted HFS+ volumes, rendering them unmountable, unconvertible to APFS, and unerasable. This change makes storage hardware using these formats unusable, a significant shift from macOS 15 Sequoia which still offered partial functionality.