Starting with macOS 28, Apple will no longer support encrypted Mac OS Extended, or HFS+, volumes. Users will need to decrypt them or reformat them as APFS to keep using them. 9to5Mac reports: In a new support document, Apple explains that starting with macOS 28, "the Mac OS Extended file system format will be supported only for volumes (disks and other storage devices) that aren't encrypted." In practice, this means users who currently rely on encrypted HFS+ external drives or other encrypted legacy Mac-formatted volumes will need to "either decrypt or reformat any encrypted Mac OS Extended volumes."
Apple doesn't explain the reason for the change. Still, the move appears to be another step in Apple's transition to APFS, its file system with built-in encryption support, which replaced Mac OS Extended as the default Mac file system in macOS High Sierra. As a result of this change, Apple says that starting with macOS 26, Macs might notify users when they're using an encrypted Mac OS Extended disk that won't be compatible with macOS 28 or later.
According to the support page, "the notification will identify the volume by name." However, Apple says users can manually confirm whether a volume is both using Mac OS Extended format and encrypted by following these steps [...]. Apple adds that "macOS 28 and later will continue to support unencrypted volumes that use Mac OS Extended format," and notes "Mac OS Extended is also known as HFS Plus (or HFS+)."
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