The firmware included with the Raspberry Pi 2 Model B version 1.2 introduced the possibility of booting from a USB device: before that, it was only possible to boot from an SD or microSD card. But ...
If you have used the Raspberry Pi mini PC for some time and on multiple projects you have probably inadvertently remove the power supply and corrupted the operating system contained on the SD card.
If you want to use an external hard drive (or USB stick) as your main storage on the Raspberry Pi, you need to jump through a couple hoops to properly mount it and make sure it loads up on boot.
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