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You can manually unmount the partition before running Erase.

Note: Again, the Erase function will fail if the hard drive’s partition is mounted.

For mechanical hard drive, it may several minutes to hours, depending upon the size, speed, and condition of your hard drive.

For SSD (Solid State Drive), the format operation may take less than a minute to complete.

Click the “Erase…” button at the bottom.

Select “GUID Partition Map” for “Scheme”.

Click on the “Erase” button at the top.

On the left-hand pane, select the hard drive (not the partition under it, if any).

Click on the “Disk Utility” option and click the “Continue” button on the bottom to launch the “Disk Utility” application.

Do the following to format the internal hard drive: When the installer finishes loading, you will see a “macOS Utilities” window appear. Or you can run Erase twice the first time will unmount the partition and fail, and the second time will actually do the format (which will succeed).

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.

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.In the main window, you’ll see a pop-up menu under “Select the volume to become the installer.” Click on the menu and select your drive.Format the USB flash drive using these steps:.

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It’s OK if it’s not formatted as a Mac drive. Then follow these steps to create your bootable macOS High Sierra drive.

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When the download is done, you can move it over to your Applications folder.

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It now does.ĭownload Install Disk Creator by clicking on the link above. There’s another app called Diskmaker X that I’ve used before, but during the original writing of this article, it didn’t support High Sierra. It has been updated to support High Sierra.

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There’s a free app called Install Disk Creator that you can use to make the installation drive. Make a bootable installer drive: The quick way If the installer auto launches, press Command-Q on your keyboard to quit the app. This will download the installer to your Applications folder.

Under the High Sierra icon on the left of the banner, click on the Download button. This link should open the App Store app and take you directly to High Sierra. Click here to go to the macOS High Sierra section of the App Store. You also won’t find it in the App Store app under Purchased. If you already installed High Sierra, you won’t find the installer app in your Applications folder.