Normally, a device requires up to 500 mA, which can be provided by a standard USB 1.0 or 2.0. Some hard drives require more power supply than others, different types and brands of cables provide more or less energy. Then go to Sidebar and check Hard disks and External disks there as well. Make sure you tick the boxes next to External disks and Hard disks. Follow Preferences → General → Show these items on the desktop. To fix that, go to Finder and click on the Finder button in the menu bar at the top of the screen. Your settings might not be set to display external hard drives on your desktop. However, you could still check your preferences - just in case. If this is not the first time you’re using an external hard drive and experiencing such a problem, it is not likely to be an issue for you. Whatever happens, there are always ways to deal with it. But what if it’s not there? There can be many reasons for a Mac not reading a hard drive - poor connection, faulty cable or, in the worst-case scenario, corrupt hard drive data. When you plug in a hard drive into your Mac, you expect it to pop up in Locations in Finder - next to your remote disk and the computer itself. Your external drive not showing up on Mac? Here’s what to do We outline a range of straightforward solutions to an external hard drive not showing up on Mac in the following sections. However, if you're eager to fix this bug yourself, keep reading. And it gives you clearing and privacy features, including a full VPN client. It offers on-demand and real-time protection, preventing viruses and other malicious software from taking hold. To protect yourself, give MacKeeper a try.

In some cases, it could be caused by malware.

There are many reasons why your Mac might not recognize an external drive.

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