I am working on the Compute Module 3+ with 32GB emmc.i want to write data on emmc in read only mode so my data will be safe incase of any power failure etc.

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    read only mode is just that, read only. If you need a place to store files, you either need to remount it as read/write, or create a seprate partition that is read/write where you can store your data.
    – Chad G
    Jun 22 at 15:13

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