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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 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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