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Note: Western Digital has noted some of their hard drives can't boot Intel Macs no matter what the formatting:

Macdrive needed to read from Windows without a network. HFS+/GUID to boot Intel Macs, but not boot Windows, and not be readable by PowerPC Macs (pre-2006 601, 603, 604, G3, G4, G5). If you are comfortable with such routines, and have a backup in case something goes wrong, I did find these routines, which I have not tested:Ĥ.

Some versions of Mac OS X offer NTFS support if you want to fiddle with superuser command line routines. Tuxera NTFS, Google's Macfuse, and Paragon Software NTFS-Mac are three options for making it writable by Macs. NTFS for non-Mac bootable, but any Mac OS read-only without third party software larger hard drives you can use with any version of Windows to boot Windows. FAT32 for non-Mac bootable, but any Mac OS read/writable 4 GB and under drives you can use with any version of Windows to boot Windows.ģ. For more on upgrading to 10.6.5 or later, see this tip.Ģ. ExFAT for non-Mac bootable but Mac OS X 10.6.5 or later read/write hard drives that can boot XP SP 2 or higher. These common formatting options exist for hard drives and flash drives, which you may see, and are usable in the manner suggested:ġ. If you have an Intel Mac, you can see the end of this tip about several methods of partitioning. Partitioning lets you specify the format of a drive when partitioning. Not for the faint at heart, but worth a try if you have a spare drive to test it on. Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/startosinstall -converttoapfs NOĪ command which is issued in the Terminal.

There is a way at least to bypass this automatic formatting in High Sierra:

Mounting it via USB while booted off an older system renders the drive invisible. The side effect of this is that any older system than High Sierra, can't read the drive directly, unless it used shared via a networking protocol such as FTP. Note: when an SSD, or other solid state media (such as a USB stick or SD card) is used to install Mac OS 10.13 High Sierra or Mac OS 10.14 Mojave, it automatically chooses APFS. How to choose between APFS and Mac OS Extended when formatting a disk for Mac - Apple Supportĭiscusses using Disk Utility for the new file system. Mac OS 10.13, released Septemhas introduced a new file system, APFS: Note, for hard drive model specific issues, see this tip: