I have a Raspberry Pi 4 which boots from an SSD. However, if I plug in another USB-Storage and reboot the Pi it doesn't boot anymore. Only if I unplug the additional storage it boots again from the SSD. Do you know what could be the reason for this? I attach the SSD on a SuperSpeed (blue) USB-Port and the storage on a usual one.
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Consider booting from an SD card, while keeping your root FS on the SSD. You'll waste an SD card for that, sure, but you'll get a stable boot order no matter how many USB devices you have. Once the kernel boots, it will be able to use the partition UUID to find the right root device.
Dmitry Grigoryev
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