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## rpi4.boot-from-sd-rootfs-on-usb.md

      
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                Raspberry Pi 4 - Boot from SD, Rootfs on USB
              
          
    Raspberry 4B - Boot from SD and rootfs on USB


Download Raspbian from the official site


Flash it to the USB drive following the procedure detailed here


Fomat an SD Card 2/4 GB as FAT32, label "boot", flag "lba". Generate a UUID. You can use GParted for this task.


Get the UUID of the USB drive and the SD Card partitions using sudo blkid.


## flow.json
[{"id":"480ae6de.258fb","type":"tab","label":"Flow 2","disabled":false,"info":""},{"id":"5f7764b8.b5ffb4","type":"inject","z":"480ae6de.258fb","name":"","topic":"","payload":"0.5","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":90,"y":80,"wires":[["b852b54b.f343c8"]]},{"id":"b3b69bb1.4fa6","type":"inject","z":"480ae6de.258fb","name":"","topic":"","payload":"2.5","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":91.08332824707031,"y":139.41665649414062,"wires":[["b852b54b.f343c8"]]},{"id":"dc7c3ce7.aeed48","type":"debug","z":"480ae6de.258fb","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":430,"y":180,"wires":[]},{"id":"b852b54b.f343c8","type":"rbe","z":"480ae6de.258fb","name":"Block if value change > 0.0000000000000000000000001","func":"narrowband","gap":"0.0000000000000000000000001","start":"2.5","inout":"in","property":"payload","x":407.00001525878906,"y":111.83334350585938,"wires":[["dc7c3ce7.aeed48"]]