WD My book not showing on Mac

If your WD My Book external hard drive is not showing on your Mac, the problem may be related to the USB connection, Finder settings, disk mounting, formatting, or macOS permissions. Fortunately, you can try several troubleshooting steps before assuming the drive has failed.

1. Check the Cable and Connections

Start with the simplest possibility. Disconnect the WD My Book from your Mac and reconnect it securely.

Try:

Disconnecting and reconnecting the USB cable.

Using another compatible USB cable.

Connecting the drive directly to the Mac instead of through a USB hub.

Trying another USB port or adapter.

Making sure the My Book's power cable is connected.

If the drive has a power indicator, check whether it turns on.

2. Check Finder Settings

Your WD My Book may be connected but hidden from your Mac's desktop or Finder sidebar.

Open Finder, then select Finder > Settings. Under General, make sure external disks are selected to appear on the desktop. Then check Sidebar and enable external disks there as well.

If the drive appears in Finder after changing these settings, there is no hardware problem; it was simply hidden.

3. Check Disk Utility

If your WD My Book still isn't visible in Finder, use Disk Utility to determine whether macOS recognizes the hardware.

Open Applications > Utilities > Disk Utility.

Select View > Show All Devices. Look for your WD My Book in the left-hand panel.

If you can see the drive but it is greyed out, select it and click Mount.

If it mounts successfully, open Finder and check whether the drive is now available.

4. Run First Aid

If Disk Utility recognizes the My Book but it won't mount, the file system may have errors.

Select the affected volume in Disk Utility and choose First Aid. Follow the onscreen instructions and allow macOS to check the disk.

Important: If the drive contains important files, avoid formatting or erasing it simply because macOS cannot mount it. Those actions can remove access to your data.

5. Check System Information

If the WD My Book doesn't appear in Disk Utility, check whether macOS detects the physical device.

Hold the Option key, click the Apple menu, and select System Information. Look under the USB or Thunderbolt/USB4 sections, depending on your Mac.

If the drive appears there but not in Disk Utility, the issue may involve the disk's partition or file system.

If it doesn't appear at all, investigate the cable, power supply, adapter, USB port, or the drive itself.

6. Consider the Drive's Format

The drive's file system can affect how macOS reads and writes data. WD My Book drives may be formatted for Windows or Mac depending on how they were originally configured.

For example, macOS can generally read NTFS drives but has limited native write support. A damaged or unsupported partition can also prevent the drive from mounting normally.

Check the drive's format in Disk Utility before making any changes.

7. Restart Your Mac

A simple restart can clear temporary USB or file-system communication problems.

Disconnect the WD My Book, restart your Mac, wait until macOS loads completely, and then reconnect the drive.

If you're using an adapter or docking station, connect the drive directly to the Mac during testing.

8. Test the Drive on Another Computer

If your WD My Book still isn't showing, connect it to another compatible computer.

If another computer recognizes the drive, the problem is likely related to your Mac, adapter, settings, or file-system compatibility.

If no computer detects the drive, there could be a problem with the cable, enclosure, power supply, or internal drive.

Final Thoughts

When your WD My Book not showing on Mac, don't immediately erase or reformat the drive. First check the physical connections, Finder settings, Disk Utility, and System Information. If the drive is detected but won't mount, First Aid may help. If important files are stored on the drive, prioritize data recovery before attempting destructive repairs.