The Twilight of Encrypted HFS+ in macOS

AuthorAlex J.
Date9 Jul 2026
Read2 min
Computers
The Twilight of Encrypted HFS+ in macOS
The evolution of file systems has always been a gradual yet inevitable trajectory of optimization, driven by the demands of emerging hardware. For years, Apple has steered toward the total integration of APFS, aiming to fully unlock the performance capabilities of modern solid-state drives. With the launch of macOS 28, the company is finally severing one of its last remaining ties to its legacy architecture. The discontinuation of support for encrypted HFS+ volumes serves as the final movement in this transition toward modern data storage standards.

The evolution of macOS has always been defined by a steady departure from legacy technologies in favor of more efficient and secure solutions. One of the most fundamental shifts in this trajectory was the transition from Mac OS Extended (HFS+) to the Apple File System (APFS). While HFS+ was engineered for the era of spinning-platter hard drives, APFS—introduced in macOS 10.13—was designed from the ground up for solid-state drives, introducing critical advantages such as instantaneous snapshots, optimized space management, and enhanced crash resilience.

With the arrival of macOS 28, Apple is entering the next phase of this transformation by curtailing the functionality of its legacy file system. The OS will now cease support for encrypted HFS+ volumes. This change specifically impacts external drives and any other storage devices that simultaneously utilize Mac OS Extended and encryption mechanisms. Notably, unencrypted HFS+ volumes will remain compatible, allowing legacy disks to be used in read-only mode or for basic, password-free data storage.

For users with data residing on encrypted HFS+ volumes, Apple offers two migration paths. The first, and most drastic, involves a complete reformat of the drive to APFS or APFS Encrypted. While this method guarantees peak performance and full compatibility, it entails total data loss, making comprehensive backups an absolute prerequisite.

The second option is a more surgical, albeit labor-intensive, alternative: decrypting the volume first and subsequently converting it to APFS. This approach preserves data integrity but comes with a critical caveat: it is inapplicable to encrypted Time Machine backups. In such cases, users will be forced to reevaluate their archival strategy entirely.

Apple continues to adhere to its traditional strategy of "soft" deprecation. Warnings regarding these changes first appeared in macOS 26, providing owners of legacy drives ample time to prepare. For the vast majority of modern users, this transition will be imperceptible, as APFS has been the default standard for years. However, for those still relying on decade-old archival disks, this move serves as a stark reminder that in the world of high technology, stagnation is equivalent to regression.

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