How to read a UUID to determine whether it’s supposed to be random, or has a specific meaning. Where you’ll find them, and whether you’ll ever see two the same.
GPT
Where would you find a 7C3457EF-0000-11AA-AA11-00306543ECAC? How UUIDs have taken over to identify so much, and how to generate your own.
From the GPT division of storage space, through APFS containers, down to individual volumes, an account of how APFS works.
How APFS containers and volumes work. What hard links, clones and sparse files are, and when they break down.
The differences between HFS+ and APFS volumes explored. What a container is, and how to add new HFS+ and APFS volumes to a disk.
Boot disk volume layout is intricate in Big Sur. M1 Macs lose the EFI partition on their internal SSDs and gain two more for APFS. Contents of /System/Volumes has also changed.
What you need to know about disk formatting using the GUID Partition Table (GPT) to understand its problems and how to repair it.
They’re almost everywhere now: UUIDs and GUIDs identify disk volumes, printers, even the processes running on your Mac. Here’s an explanation.
The Eclectic Light Company 