External Hard Drive Slows Down After Update to High Sierra

Do you have a lot of photos from vacation? Favorite TV shows, serials, and movies took the entire hard drive space on your desktop Mac? Got no free space to store the music on a laptop? In all these cases, an external HD will help.

How is an external HD arranged?

An external hard drive is a small box, which usually has is a laptop hard drive inside. It is connected to a computer mostly via USB ports with the help of the USB cable that is sold with the device. The same way an external HD gets a power supply and, as a rule, doesn’t require other sources of power.

How to tune an external HD?

As for a personal computer or notebook running on the Windows operating system, there is no need to invent the wheel – everything is ready. Almost all external hard drives for such machines are formatted for the use with Windows OS right at the factory, and only individual batches are formatted for the use with macOS.

For the correct use of the external HD on Apple computers and laptops, an external HD needs to be reformatted.

This process doesn’t take much time and is performed using special built-in macOS utility equipped with an excellent graphical interface.

External HD and High Sierra compatibility issues

After the release of the latest High Sierra update, quite a lot of criticism appeared on tech-related forums regarding the incompatibility of updated computers and external HDs. Users note that Macs work fine if you do not have the external HDs connected to it. As soon as you try to attach the drive, the computer starts to experience lags and hangs; sometimes, it takes a dozen minutes to open a light application.

At the same time, activity monitoring shows a high CPU usage, and external HD produces huge noise when under high load.

Suggested solutions

If the performance of your computer has dropped significantly, or Mac doesn’t see the external HD, or other problem with the drive arises, resort to the following steps:

  • Reformatting

Have you upgraded your Mac to macOS High Sierra? Then do not forget to reformat your external HDs to APFS. This is a new file system adapted to flash memory and designed to replace the outdated HFS+.

Reformatting will provide more stable OS performance, increase the speed of reading/writing data and will further protect user information.

  • USB hub

Check to make certain that your external HD is actually joined to the USB hub. Also, you can connect the drive to another USB hub.

  • Updating drivers

If you experience problems with Mac and the external HD after installing High Sierra updates, try to download and install the latest versions of drivers for your external HD.

If the above tips were unsuccessful, try to reinstall High Sierra on your device.