If the drive is showing, but you’re getting messages about the drive needing to be formatted, etc., then read the next section below. Pick a letter for your drive and you should be good to go. In Disk Management, just right-click on the disk and choose Change Drive Letter and Paths. Normally, Windows does this automatically, but sometimes because of other connected devices, your external hard drive will be recognized, but not have any drive letter assigned to it.
If the drive shows up here, but not in Windows Explorer, you might have to assign a drive letter to the disk. In order to figure out whether your problem is related to formatting or to not being recognized, go to Disk Management in Windows or Disk Utility on OS X and see if the drive shows up there. This is usually a problem with drivers or hardware. Learn more about reinstalling m acOS.The other main reason is that the drive simply is not being recognized by Windows or Mac and therefore won’t even show up on your system at all. If you want your Mac to start up again from the volume you just you erased, select Reinstall macOS in the utilities window, then click Continue and follow the onscreen instructions.When done, quit Disk Utility to return to the utilities window.
Optional: If you previously used Disk Utility to add internal volumes other than Macintosh HD, you can erase them individually using the same process.If this button isn't shown, click Erase instead. Format: APFS or Mac OS Extended (Journaled), as recommended by Disk Utility.Click the Erase button in the toolbar, then enter the requested details:.Select Macintosh HD in the sidebar of Disk Utility.
From the utilities window, select Disk Utility and click Continue.If asked, select a user you know the password for, then enter their administrator password.Start up from macOS Recovery: Turn on your Mac, then immediately press and hold these two keys until you see an Apple logo or other image: Command (⌘) and R.
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