Apple has updated its support documentation to say that encrypted Mac OS Extended (HFS+) volumes will no longer be supported in macOS 28. As a result, encrypted HFS+ storage devices that users rely on today will stop working with macOS 28 unless they take action before upgrading. Apple does not provide a specific reason for the change. Reporting across outlets notes that Apple has been moving away from HFS+ in favor of APFS for years, with APFS becoming the default filesystem for Macs since 2017 and natively supporting encryption.

The transition begins to surface before macOS 28: Apple states that macOS 26 may display alerts when an encrypted HFS+ drive is detected and warn that the volume will not be compatible with macOS 28. Users can also check manually via Disk Utility or Finder “Get Info” to see whether a volume is both “Mac OS Extended” and marked “Encrypted.”

Apple’s guidance for affected users is to back up data first, then either decrypt the drive (to remove encryption while keeping the HFS+ format) or reformat it to APFS or APFS (Encrypted), which erases the volume. Unencrypted HFS+ volumes remain supported beyond macOS 28.