A complete guide to the structure and layout of APFS startup disks from High Sierra to Big Sur (Intel), together with tear-out PDF charts.
Important update for all users, which addresses several bugs in setting the maximum size of sparse bundles.
How to set the total size, and band size, for your sparse bundles, with calculation of the critical band size.
Five different classes of metadata, from file system attributes to embedded Info.plist files, explained and explored.
How your Mac’s security and privacy systems can cause duplicate copies of files to be written to your backups.
Do changing permissions or an extended attribute also alter a file’s modification date?
Q: Can an app running from this user account read/write this file? It should be simple to answer, but reality isn’t as kind.
What has happened in the Applications folder: two apps with an identical name? Isn’t it protected by SIP anyway?
macOS Catalina is the first version of macOS which boots not from a single volume, but from two: […]
Updated for 10.15 release, with a clearer explanation of how Catalina’s new boot Volume Group works in practice, in the Finder and Terminal.