How to reset your external hard drive mac

How to access an external drive that’s not recognized on a Mac

Only APFS-formatted disks show containers. If your disk doesn't appear in Disk Utility, disconnect all nonessential devices from your Mac. If the disk is external, leave it connected, but make sure that it's turned on and connected directly to your Mac using a good cable. Then restart your Mac and try again. You can erase a disk or a volume on that disk at any time, including in circumstances such as these:. Are you formatting the disk that came built into your Mac? Are you about to install macOS High Sierra or later on the disk?

How to Format or Partition an External Hard Drive for Mac

If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended Journaled. Are you preparing a Time Machine backup disk or bootable installer? Will you be using the disk with another Mac? Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu.


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How to erase a disk for Mac Use Disk Utility to erase format a hard disk, flash drive, or other storage device for Mac. If you want to erase your computer's main hard drive, things get a little more complicated.


  • How to Format an External Drive to Work with Mac (from NTFS to Mac OS Extended)?.
  • Format an External Hard Drive or USB Flash Drive for Mac OS X;
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  • How to Format or Partition an External Hard Drive for Mac.
  • How to Format an External Drive for Mac Compatibility?

You obviously can't erase the drive while you're using it, so you'll need to format from a bootable CD or USB drive. What tools you use depend on what you're trying to do. If you're going to sell your computer or the hard drive, you'll want to securely wipe it using these instructions beforehand.

Format external drives to Mac OS Extended before using with Aperture

After you've done so, you can reinstall your operating system if necessary as described below. If you just want to reinstall your operating system or install a new one , the installer can do the formatting for you. Just insert your Windows, OS X, or Linux installation disc or drive , boot from it , and enter the installation. If you're installing OS X or Linux, you usually just need to choose the option to install from scratch, which will erase your drive. In the Windows installer, wait until you get to the screen with a list of your drives.

How to fix an external disk drive that won't show up on a Mac

Make sure you've backed everything up before you reinstall! That's all there is to it. The process is much simpler than this long guide would have you believe, and once you've gotten the hang of it once or twice it'll be like riding a bike. All it takes is a few clicks to get a fresh, clean drive formatted for your needs.


  • Format an External Hard Drive or USB Flash Drive for Mac OS X.
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Emailable Tech Support is a series of easy-to-share guides for the less tech savvy people in your life. Click the icon for your external hard drive in the sidebar on the left. Click the Erase tab along the top of the window. Enter a name for the external hard drive in the Name field. Click the Erase button. Published Date: Fri May 06 Yes No. Character limit:

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