Oct 03, 2017 External mac os extended journaled HDD not compatible with High Sierra? I can't believe Apple would drop the ball on such a HUGE issue. My boot SSD is APFS. Some Macworld readers are concerned about upgrading to macOS High Sierra, which offers the new APFS (Apple File System) that replaces the nearly 20-year-old HFS+ filesystem. APFS offers a lot of. Oct 17, 2017 Mac OS X Extended offers compatibility with High Sierra as well as Macs running older versions of the macOS operating system. Your Time Machine drive can’t be formatted APFS yet, either. Time Machine can back up from an APFS drive, but the Time Machine destination drive must be formatted as HFS+.
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Disk Utility User Guide
Disk Utility on Mac supports several file system formats:
Apple File System (APFS)
Apple File System (APFS), the default file system for Mac computers using macOS 10.13 or later, features strong encryption, space sharing, snapshots, fast directory sizing, and improved file system fundamentals. While APFS is optimized for the Flash/SSD storage used in recent Mac computers, it can also be used with older systems with traditional hard disk drives (HDD) and external, direct-attached storage. macOS 10.13 or later supports APFS for both bootable and data volumes.
APFS allocates disk space within a container on demand. The disk’s free space is shared and can be allocated to any of the individual volumes in the container as needed. If desired, you can specify reserve and quota sizes for each volume. Each volume uses only part of the overall container, so the available space is the total size of the container, minus the size of all the volumes in the container.
Choose one of the following APFS formats for Mac computers using macOS 10.13 or later.
You can easily add or delete volumes in APFS containers. Each volume within an APFS container can have its own APFS format—APFS, APFS (Encrypted), APFS (Case-sensitive), or APFS (Case-sensitive, Encrypted).
Mac OS Extended
Choose one of the following Mac OS Extended file system formats for compatibility with Mac computers using macOS 10.12 or earlier.
Windows-compatible formats
Choose one of the following Windows-compatible file system formats if you are formatting a disk to use with Windows.
Apfs Or Mac Os Extended For Imac Hdd High Sierra Ca
Apfs Or Mac Os Extended For Imac Hdd High Sierra Download
See alsoPartition schemes available in Disk Utility on MacAbout Disk Utility on Mac
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