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A comment on macOS Sonoma is setting records for update size. Parent comment

Re:macOS Sonoma is setting records for update size by cyberpunk on Monday December 04, 2023 @03:55AM (#38515101)
I think the OS is written to some kind of read only partition, and so they are having to write the whole thing each change? It's also why safari updates need reboots these days, isn't it?
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Re:macOS Sonoma is setting records for update size by dcow on Monday December 04, 2023 @04:04AM (#38515160)
How do you write it if it’s readonly?

Whether or not the system partition is mounted readonly for daily use doesn't have anything to do with the update size.

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Re:macOS Sonoma is setting records for update size by NikkiA on Monday December 04, 2023 @05:56AM (#38515824)
It's protected by T2, the reboot disables the system security protection (SSP) temporarily in the T2, which then allows the OS partition to be written to, then it re-enables SSP and reboots. Only 'special' signed code can enable the update mode.
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