In a significant move that marks another milestone in Apple's ongoing transition away from legacy file systems, the tech giant has announced that macOS 28 will no longer support encrypted volumes formatted with Mac OS Extended, also known as HFS+. This decision, revealed through an official support document, represents a decisive step toward consolidating Apple File System (APFS) as the sole modern storage solution for Mac users. While the change may seem technical at first glance, it carries important implications for anyone who relies on encrypted external drives or legacy storage devices.
The announcement affects users who currently depend on encrypted HFS+ volumes for data storage, backups, or other purposes. Starting with macOS 28, these encrypted volumes will become incompatible with the operating system, forcing users to take action before upgrading. Apple's guidance is clear: users must either decrypt their affected volumes or reformat them entirely to continue using them with future versions of macOS. The company has not provided a detailed explanation for this specific change, but the reasoning appears straightforward when viewed within the broader context of Apple's file system evolution.
Mac OS Extended served as Apple's primary file system for nearly two decades before being replaced by APFS in macOS High Sierra. Introduced in 1998, HFS+ brought journaling capabilities and improved performance over its predecessor, becoming the standard format for Mac storage. However, as technology advanced and security requirements evolved, Apple recognized the need for a more modern solution. APFS, launched in 2017, was designed from the ground up with contemporary computing needs in mind, including native encryption support, better flash storage optimization, and enhanced data integrity features.
The transition from HFS+ to APFS has been gradual, allowing users and developers ample time to adapt. Apple made APFS the default file system for macOS installations starting with High Sierra, but maintained backward compatibility with HFS+ for several years. This approach ensured that users with older hardware or existing HFS+ volumes could continue working without disruption. However, maintaining dual file system support comes with technical overhead, and Apple appears ready to streamline its ecosystem by focusing exclusively on APFS for encrypted volumes.
One notable aspect of this change is the timing of user notifications. According to Apple's support documentation, Macs running macOS 26 may begin displaying warnings about encrypted Mac OS Extended volumes that will become incompatible with macOS 28 and later versions. These notifications will identify affected volumes by name, giving users advance notice to take appropriate action. This early warning system demonstrates Apple's commitment to minimizing disruption, even as it pushes forward with technological modernization.
For users concerned about whether their storage devices are affected, Apple provides clear instructions for verification. By opening Disk Utility, accessible through the Applications folder or via Spotlight search, users can check the status of their volumes. After selecting "Show Only Volumes" from the View menu, users should examine the information displayed beneath each volume name. If both "Mac OS Extended" and "Encrypted" appear in the description, that volume will not be compatible with macOS 28 and subsequent releases. An example of such a designation might read "CoreStorage Logical Volume • Mac OS Extended (Case-sensitive, Journaled, Encrypted)."
Users facing this compatibility issue have two primary options for resolving it. The first approach involves completely erasing and reformatting the affected volume using APFS or APFS (Encrypted) format. While this method ensures full compatibility with future macOS versions, it permanently deletes all data stored on the volume. Consequently, users must back up any important files before proceeding with this option. This path is particularly suitable for those who maintain regular backups or whose data can be easily restored from other sources.
The second option allows users to preserve their data while still achieving compatibility. This method involves decrypting the volume first, which removes the encryption layer without deleting files. It is important to note that this solution does not apply to encrypted Time Machine backup disks, which require special handling. To decrypt a volume, users should connect the drive to their Mac and enter the encryption password when prompted. Next, they can control-click the drive icon on the desktop or in Finder's sidebar and select "Decrypt" from the shortcut menu. After entering the password again, the decryption process begins, which may take considerable time depending on the volume size. Users can monitor progress by entering "diskutil cs list" in Terminal.
Once decryption is complete, users have the option to convert the volume to APFS format without erasing its contents. This conversion can be performed through Disk Utility by selecting the volume and choosing "Convert to APFS" from the Edit menu. After the conversion finishes, users can optionally encrypt the APFS volume if desired, using the same control-click method described earlier. This approach offers the best of both worlds: data preservation and modern file system compatibility.
The decision to drop support for encrypted HFS+ volumes reflects broader industry trends toward standardized, secure storage solutions. Modern file systems like APFS offer advantages that legacy formats simply cannot match, including better performance on solid-state drives, improved snapshot capabilities for backups, and more robust encryption mechanisms. By concentrating development efforts on APFS, Apple can deliver enhanced features and security improvements without the burden of maintaining outdated technologies.
Security considerations play a crucial role in this transition. APFS was designed with encryption as a core feature rather than an add-on, providing more seamless and reliable protection for user data. The built-in encryption in APFS operates at the file system level, offering better integration with macOS security frameworks compared to the CoreStorage encryption used with HFS+ volumes. This architectural difference makes APFS a more suitable foundation for protecting sensitive information in today's threat landscape.
For businesses and professional users who rely on encrypted external storage, this change necessitates careful planning. Organizations should audit their current storage infrastructure to identify any encrypted HFS+ volumes in use. IT departments may need to coordinate migration efforts to ensure business continuity, particularly for teams that depend on shared encrypted drives for collaborative work. The advance notification period provided by macOS 26 should give organizations sufficient time to implement necessary changes without disrupting operations.
Individual users should also take proactive steps to prepare for this transition. Those who maintain encrypted external drives for personal backups, media libraries, or sensitive documents should verify their volume formats and plan accordingly. The decryption and conversion process, while straightforward, requires time and attention to detail. Rushing through these steps without proper backups could result in data loss, so patience and careful execution are essential.
Looking ahead, this change signals Apple's continued commitment to modernizing its ecosystem. As hardware evolves and user expectations shift toward greater security and performance, maintaining support for legacy technologies becomes increasingly challenging. By streamlining its file system support, Apple can focus resources on enhancing APFS capabilities and delivering innovations that benefit all Mac users.
The transition away from encrypted HFS+ volumes represents more than a technical adjustment; it reflects Apple's philosophy of balancing innovation with user accessibility. While change can be inconvenient, the long-term benefits of adopting modern file systems include improved reliability, enhanced security, and better overall performance. Users who embrace this transition will find themselves better positioned to take advantage of future macOS features and capabilities.
As macOS 28 approaches, users should remain vigilant about their storage configurations and take advantage of the early warning notifications provided by macOS 26. By acting proactively and following Apple's recommended procedures, the transition can be smooth and relatively painless. The key is preparation: backing up data, verifying volume formats, and executing the necessary changes well before the deadline imposed by the new operating system.
This development serves as a reminder that technology continues to evolve, and staying current with these changes is essential for maintaining optimal device performance and security. Apple's decision to drop support for encrypted Mac OS Extended volumes in macOS 28 marks the end of an era for HFS+, but it also opens the door to a more secure and efficient future built on APFS foundations.
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