[Fixed] External Hard Drive Keeps Disconnecting on a Mac

Since updating macOS yesterday, my drives are constantly disconnecting. Some will work for a while and then disconnect; some will not even show up at all, and when I get them to show up, they disconnect again rather quickly. How do I fix my external hard drive that keeps disconnecting on a Mac?

People who updated their macOS have reported a problem that the external hard drive keeps disconnecting on a Mac. If this error occurs on your external hard drive, don't panic! This post will tell you how to solve the disconnecting error and recover an unmountable drive on a Mac.

When this error happens, the most important thing is to make sure that the data you have stored on the external hard drive is safe. Consider using the professional and trusted data recovery software EaseUS Data Recovery Wizard for Mac to recover your data quickly and safely.

Check out the following steps to perform an external hard drive recovery:

After restoring data from the external hard drive, you can solve the disconnecting error without any worries about data loss! Here's how to check the issue point:

• Use another USB port to check if the USB port is damaged.
• Plug the external hard drive into another computer to check if the disconnecting is due to your Mac or the hard drive itself.

Suppose the disk errors on your external hard drive cause the disconnecting error, such as com.apple.DiskManagement.disenter error 0. Try the following methods:

Method 1. Run First Aid in Disk Utility to repair disk errors.

Method 2. Reformat your external hard drive to make it workable.

Note: formatting an external hard drive will delete all stored data on it, so use the EaseUS data recovery tool to restore your data before formatting it.

Suppose the disconnecting error is caused by system glitches on your Mac. Try the following methods:

Fix 1. Restart your Mac and plug the external hard drive to try again.

Fix 2. Check the Software Update to make sure your macOS is up to date.