Ideally, you should fix the external hard drive keeps disconnecting on Mac issue with a correct OS running. Moreover, you can downgrade macOS by creating a bootable installer. If you don't have a Time Machine backup, you can downgrade the system by choosing the Reinstall macOS option in macOS Recovery mode. If you've backed up the system with Time Machine before upgrading to the current system, you can easily downgrade macOS by choosing the backup file in the Restore from Time Machine Backup option. If your Time Machine backups are encrypted, you might need to authenticate changes to the drive with your administrator password.
All you need to do is start copying files and folders onto the drive using Finder. Otherwise, you'll face dilemmas such as macOS downgrade failure or slow performance. Technically, there's no need to partition your hard drive if you want to use it for external storage as well as Time Machine backups. Spare enough space for the older macOS by erasing your Mac hard drive in macOS Recovery mode. After that, follow the simple guide below to downgrade the OS. You can either back up the Mac by using the Time Machine or other cloud storage methods. Therefore, backing up the system is a must-have. Unlike macOS updates, downgrading the macOS will erase every piece of data on your Mac device. Try connecting the external hard drive to it now, is the drive still disconnecting off and on? Your Mac will restart when the upgrade is finished. If there's a macOS update available, click on Upgrade Now to update your macOS to the latest version. In the Apple setting panel, find and open Software Update. In the drop-down list, choose System Preferences. Click on the Apple menu from the top-left corner.
Hopefully, you can fix external hard drive keeps disconnecting Mac. Since your external hard drive still keeps disconnecting after trying out multiple methods, the only resort for you now is to update or downgrade the current macOS.
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