APFS Internals: The macOS Filesystem Revealed

APFS is the filesystem underneath every modern Mac, iPhone, and Apple Watch — and it is almost entirely invisible. This book opens it up: containers and volumes, copy-on-write, snapshots and clones, checkpoints, the sealed System volume, and the key hierarchy behind FileVault. Real commands, real output, and the reasoning behind each design decision. For developers, administrators, and anyone who ...