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"The Disk You Inserted Is Not Readable by This Computer" Error When Connecting a Garmin Device to a Mac

When plugging a mass storage Garmin device into the USB port on a Mac, the following error message may display:

The disk you inserted is not readable by this computer

This generally occurs when the device is not functioning correctly or when its internal memory is corrupt.

In Order to Resolve This Issue, Repair the Disk Using Disk Utility. 

1. Connect the device to the computer.

2. Click Finder.

red box around smiley face finder icon

3. Click Applications.

red box around Applications in Finder window

4. Double-click the Utilities folder.

Red box around Utilities folder in Finder window

5. Double-click Disk Utility.

red box around Disk Utility

6. Select the Garmin drive.

red box around Garmin Drive

7. Click First Aid.

red box around First Aid

8. Click Run.

red box around run button

After the repair, the device should communicate properly with the Mac.