what is apfs
Apple File System. Not to be confused with Apple File Service (AFS), the service implementing the Apple Filing Protocol (AFP), formerly AppleTalk Filing Protocol. Apple File System (APFS) is a file system for macOS, iOS, tvOS and watchOS that is being developed and deployed by Apple Inc. It aims to address the core issues of the existing HFS+ (also called Mac OS Extended) file system in use on these platforms today.