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I'm trying to create a bootable USB. I followed the instructions as outlined:
https://support.apple.com/en-ca/HT201372
It appeared to create the bootable installer as per the instructions. However, when I try to select the new disk from the startup, it is not listed.
Here is what I see from the Start Up App. Also below is the the USB information.
Any suggestions?
(I'm on a Mac Mini 2014 with Mojave 10.14.5)
Thanks
Mac mini 2018 or later
I believe that I see your problem. You will have to Erase it and start over. Your Data Traveler G3 USB drive has to be formatted MacOS (Extended Journaled), which it appears to be. However, you need to use a GUID Partition Map scheme, not Master Boot Record. Try that and see if it works. It should show up in System Preferences/ Startup Disk. I just plugged my macOS 10.14.6 bootable USB installer in, and it showed up right away as a startup disk.
If you copy the command from the Apple Support Article, make sure to name the drive "MyVolume" (without the quotation marks). Open Terminal and paste the command in the Terminal window. Enter your administrative password. It will ask if you want to erase your USB drive. Hit the Y key on the keyboard and Enter. Give a little time to finish.
I believe that I see your problem. You will have to Erase it and start over. Your Data Traveler G3 USB drive has to be formatted MacOS (Extended Journaled), which it appears to be. However, you need to use a GUID Partition Map scheme, not Master Boot Record. Try that and see if it works. It should show up in System Preferences/ Startup Disk. I just plugged my macOS 10.14.6 bootable USB installer in, and it showed up right away as a startup disk.
If you copy the command from the Apple Support Article, make sure to name the drive "MyVolume" (without the quotation marks). Open Terminal and paste the command in the Terminal window. Enter your administrative password. It will ask if you want to erase your USB drive. Hit the Y key on the keyboard and Enter. Give a little time to finish.
Bootable USBs do not show up in System Preferences> Startup Disk. What you need to do is restart the Mac, whilst it is restarting press and hold down the option/alt key until the Startup Manager screen appears, then you can select the USB press Return
your Mac will no restart to your bootable USB.
Thanks Eau and fussymo.
Neither of those options worked.
With regards to formatting the usb drive as a GUID Partition Map scheme, that option does not exist. When use the disk utility, the partition options is greyed out:
In the format option, I only get the below selections:
Eau, when I try your suggestion, I still only see the internal drive as an option to start up, not the USB.
Any other suggestions?
Thanks!
Here is an formatting example using a SanDisk USB drive. The main device is the "SanDisk Cruzer Switch Media", not the volume "Untitled" beneath it. You have to select the main drive device to get the GUID Partition map option. Yours would probably be your "Kingston Data Traveler G3 Media", or something like that.
Thanks Matti and fussymo. That did the trick!
I don't know if the apple instructions were not clear about that (erasing the device rather than the volume) or if I missed that detail...makes a big difference!
In Disk Utility's upper left View > Show All Devices. Then Select the device, not the volume under it.
Start Up utility not recognizing USB boot disk
