Can i boot up from original hard drive which is now an external hard drive

Hello,my original hard drive was transferred from inside my laptop and contained now in a caddy for use as an external hard drive.,via USB.
Can i now boot up and have everything working as if hard drive was still internal.or will i have to swop it back?
Thanks in advance
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More about boot original hard drive external hard drive
  1. If your BIOS sees the USB device you can boot from it. It's going to be slower, but should work just fine.
  2. If you are booting Windows it rarely works, as soon as Windows loads the drivers for the USB port it'll reset the port and drive attached...
  3. If it is connected via USB 2 interface, it will be really slow. You need to set USB as the first boot device via BIOS for it to work.
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