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This is a common failure mode for SD cards. The blocks on your SD card are worn out, and it has run out of replacement blocks. It is not accepting writes anymore.


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Confirmed, I took an SD card from a Pi 3, which I had been using for several years, and popped it into a Pi Zero 2 W. The Zero came up without a hitch. Documentation on the web says this works for Raspian. Your mileage may vary if you are using Noobs or another OS.


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Solved on AskUbuntu Stack - Ubuntu Core & Raspberry Pi Zero 2 W Solution (taken from https://qengineering.eu/install-64-os-on-raspberry-pi-zero-2.html) created rpi-zero-2-w.dtb from bcm2710-rpi-3-b.dtb file (copy) modified config with [pi0] kernel=uboot_rpi_3.bin RPi Zero 2 W is now booting OK


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I'd be tempted to manually remove the spurious line from /etc/fstab, mount the microSD card on a Linux box (or PC running a live Linux distro), and check the filesystem of each partition with fsck before attempting to boot from it again


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It may be that your SD card is having issues - they are subject to wear-out, and the cheaper ones die younger than (for example) SD cards made by SanDisk. You should edit /etc/fstab to remove the bogus entry, but keep an eye out for other strange behavior. You should also consider making a backup of your system so that you can recover your system if it fails ...


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