You can manually unmount the partition before running Erase. Note: Under macOS Sierra, the Erase function will fail if the USB drive’s partition is mounted.(USB 2.0 and large capacity drives will take longer.) After the format completes, the partition will be mounted under “/Volumes/Sierra” (or whatever name you selected above). The format operation may take several minutes to complete.Click the “Erase” button in the warning popup dialog if you get one.
Click the “Erase…” button at the bottom.Select “Master Boot Record” for “Scheme”.Select “Mac OS Extended (Journaled)” for “Format”.Input a name like “Sierra” (this name will be overwritten later).Click on the “Erase” tab (or button at the top).On the left-hand pane, select the USB drive (not the partition under it, if any).Plug the USB flash drive into your Mac.Format the USB flash drive using these steps:
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