How to Find, Open, and Use an External Hard Drive on a Mac

You plugged an external hard drive into your Mac and now you are looking for it. Maybe it is your first external drive, maybe you switched from Windows, or maybe it just is not where you expected. Using an external drive on a Mac is simple once you know where macOS puts it and how it wants you to disconnect it.

This walks through the whole thing: connecting the drive, finding it, opening your files, and removing it without losing data.

Connecting the drive

Plug the drive into a USB-C or USB-A port on your Mac. Most external drives are bus-powered and spin up on their own. A desktop drive with its own power brick needs to be switched on. Give it a few seconds to mount.

If you are using a hub or adapter, plug the drive directly into the Mac first to rule the adapter out. Cheap or damaged cables are a common reason a drive never appears.

Finding the drive in Finder

Once macOS mounts the drive, it shows up in two places:

• The Finder sidebar. Open a Finder window and look under Locations in the left column. Your drive appears there by its name.
• The desktop. Whether the drive appears on the desktop depends on your Finder settings, so this spot may be empty even when the drive is mounted.

If you do not see the drive in either place, macOS may just be set to hide it. Open Finder, choose Finder then Settings, and turn on “External disks” under both the General tab and the Sidebar tab. Now the drive shows on the desktop and in every Finder window.

If it still does not appear after that, the drive may not be mounting at all. Open Disk Utility (Applications, then Utilities) and look for the drive in the left column. If it shows there but greyed out, select it and click Mount. If it does not show in Disk Utility either, work through our guide on an external drive not showing up on Mac.

Opening and using your files

Click the drive in the Finder sidebar to browse it like any other folder. Drag files onto it to copy them over, drag them off to copy them back, and open documents directly from the drive if you want.

One thing that trips up people coming from Windows: if your drive is formatted as NTFS, macOS can read it but cannot write to it. You will be able to open and copy files off the drive, but not save anything back. That is a macOS limitation, not a broken drive. If you own the drive and can move its data elsewhere first, reformatting it solves this. Our guide on exFAT vs NTFS on a Mac explains the choice, and APFS vs exFAT covers the Mac-only option.

Disconnecting it safely

This is the step people skip, and the one that actually protects your files. macOS buffers writes to a drive and finishes them a moment later, so pulling the cable early can leave a file half-written.

To disconnect an external drive, select it in Finder and press Command-E, or click the eject icon next to it in the sidebar. Wait for it to disappear, then unplug it. There is more detail, including every method, in how to safely eject an external hard drive on Mac.

When it won’t eject

If macOS says “The disk wasn’t ejected because one or more programs may be using it,” some process still has a file open on the drive and macOS will not name it. Common holds are Spotlight indexing the drive, an open QuickLook preview, or a cloud sync client.

You can hunt the process down in Terminal with lsof, or you can let Ejecta do it. Ejecta sits in your menu bar, shows exactly which process is holding the drive, and quits it so you can eject in one click. It is the difference between guessing and knowing.

The short version

Plug the drive in, find it under Locations in the Finder sidebar, and turn on “External disks” in Finder Settings if it is hidden. Browse and copy files like a normal folder. When you are done, press Command-E to eject before you unplug. If it refuses to eject, something is using it, and finding that something is the fix.