Explainer: macOS updates – The Eclectic Light Company
eclecticlight.co/2026/02/28/explainer-macos-updates
What Jamie wrote
Deep technical explainer on how macOS updates work — from old Installer packages through Catalina's split volumes to Big Sur's Signed System Volume. Good reference if you've ever wondered what's actually happening during updates.\n\nPull quote: "Big Sur brought the greatest structural change in Mac operating systems since the introduction of Mac OS X twenty years earlier."
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