USB Ejects when trying to create bootable Installer for mac OS

Trying to create a bootable USB drive, however, the usb/flash drive will eject. I am currently using a 64 gb USB drive. I have timed it and it ejects in about 4 minutes once the bootable drive process starts. I have used multiple USBs and all have ejected. I have also turned off "put hard disk to sleep when possible" in energy saver. I plug the USB directly into my IMAC late 2012 version running Mojave. I have been following the specific directions on the Apple support page https://support.apple.com/en-us/HT20137. I am able to get to the last step however, when it starts trying to copy over it is eject in the middle of it.

Posted on Apr 9, 2020 3:02 PM

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3 replies

TwTr Author

Level 1

10 points

Apr 10, 2020 9:23 PM in response to rkaufmann87

I have tried it with formatting a USB to Mac OS Journal and used a USB right out of the box, however, both were ejected prematurely. The USB straight out of the box was able to get to 90% copied over before it was ejected towards the tail end of the install.

rkaufmann87

Level 10

148,488 points

Apr 9, 2020 3:44 PM in response to TwTr

How is the USB drive formatted?

dialabrain

Level 10

136,103 points

Apr 10, 2020 9:32 PM in response to TwTr

FWIW, make sure the scheme is set to GUID as well.

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USB Ejects when trying to create bootable Installer for mac OS