macOS 27 does not support CoreStorage volumes
macOS 27 breaks automatic mounting and erasing of CoreStorage volumes, rendering encrypted storage inaccessible.
macOS 27 no longer supports CoreStorage volumes or encrypted HFS+ volumes out of the box. Users cannot mount, convert, or erase affected volumes using standard tools, breaking access to storage. A workaround requires deleting the logical volume group and restarting the machine.
- Volumes cannot be mounted automatically or via Disk Utility
- Lower-level mount_hfs allows read-only access
- Erase and convert tools fail with resource busy error
- Workaround: delete logical volume group then restart
Impact: Loss of access to encrypted storage volumes
| Product | Affected |
|---|---|
| Apple macOS | 27 |
- 1.Use lower-level mount_hfs for read-only access
- 2.Delete logical volume group and restart
From the original article
5 min read at wadetregaskis.commacOS 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.
By colejohnson66 · wadetregaskis.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.