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  1. How to make all/most filesystems read-only in arch linux arm

    Why?

    Degradation of micro-SD cards can be slowed if write access is reduced. Furthermore, unexpected power cycles are less dangerous if partitions are mounted read-only.

    minimum

    /etc/fstab

    Add ro to options of desired file systems (e.g. /boot).

    kernel parameters

    Add ro in /boot/cmdline.txt or /boot/grub …

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