APFS volumes currently cannot be used as startup disks, Time Machine volumes, or even as part of a Fusion Drive. The newly re-named macOS Sierra will give Mac users their first look at APFS soon, but if you are planning to be part of the public beta test for the new operating system, there are some things you’ll want to look out for. ( Note: You can read Apple’s APFS documentation here and watch an introduction video here.) As new versions of Apple operating systems roll out later in 2016 - macOS Sierra, iOS 10, tvOS 10 and watchOS 3 - existing devices will use APFS. With the roots of the file system now over 30 years old, Apple just announced a new file system called APFS (Apple File System) that will be shipped on all new Apple devices starting in 2017. All Macs currently use a file system called HFS+ (Hierarchical File System Plus), an outgrowth of the original Hierarchical File System that was introduced in 1985 with Mac System 2.1. A file system is used by an operating system like macOS and iOS to read from and write to some sort of storage, whether it’s a huge hard disk drive or a speedy solid-state drive (SSD). Without a file system, your Mac, iPhone, iPad or even your Apple Watch would not work. IOS 10.3 Update with APFS Now Available to public
