External drive not showing in boot?

Trying to set up Mint for a friend on his PC. I installed it on an external hard drive. When I plugged it into his PC, it isn’t showing on the boot list but it shows on mine which is confusing me. I tried to disable the secure boot but still, nothing. I am not sure why the external drive isn’t showing on his PC.

What kind of PC is it? And what size is the HDD?

Do you have another drive? It can be a defect of the drive you are trying to use. I have had this happen with a few lesser-known brands. For whatever reason, not all computers read them.

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Agreed @nightstar I was playing around with XPE, and my USB drive was bad. I had to get a Samsung brand USB drive, which did the trick :smile: