Thursday, 19 July 2018

windows 7 - Why is a bootable USB drive is showing up among the startup disks on a MacBook but not on an iMac?

I have a mid-2011 iMac and I'm trying to install Windows via Boot Camp.


Using the app worked well. It created the USB boot drive with a Windows 7 ISO. The problems started when Boot Camp restarted the iMac, and it couldn't detect the USB drive.


I tried troubleshooting by restarting the iMac whilst holding down Option to show the startup disks. The USB drive didn't show up despite being on and lit up. The drive shows up in the Finder and Disk Utility, just not when I try to boot from it.


The most annoying thing is I tried using the drive on my mid-2015 MacBook Air and managed to boot up with it. Indeed the drive shows up when booting with Option held down.


Why? Why does it show up on one computer and not the other? Why does it show up in the Finder, but not amongst the startup disks?

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