With the release of the macOS High Sierra operating system, Cupertino ditched its venerable Mac OS Extended file system, commonly abbreviated as HFS+, and switched to an entirely new file system. Best Malware Removal and Protection Softwareīefore we get to Thunderbolt 3, we need to address a basic building block of hard drives that has always affected compatibility, and probably always will: the file system.Īn external drive's file system is the most important factor that determines whether or not it's readable by Macs, PCs, or both.
