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macOS 28 will not support encrypted HFS+ volumes

Apple announced that macOS 28 will no longer support encrypted HFS+ volumes, requiring users to migrate data to APFS-encrypted drives before upgrading.

Background

- Apple is dropping support for encrypted HFS+ volumes in macOS 28, meaning drives formatted with the older HFS+ (Hierarchical File System Plus) that use FileVault or other encryption will no longer mount or be accessible on that OS version. - HFS+ was Apple's primary file system from 1998 through 2017, when it was replaced by APFS (Apple File System). APFS is now standard on all Macs, iPhones, and iPads. - This change affects users who still have external drives or older Mac internal drives formatted as encrypted HFS+. They will need to migrate data to APFS or unencrypted HFS+ before upgrading. - The move continues Apple's gradual phase-out of HFS+; macOS 10.15 (Catalina, 2019) already made APFS mandatory for system volumes, and later releases have reduced HFS+ support.

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