Did Apple's Recovery Disk Assistant make my drive unreadable?

WD External Drives External Drives for Mac
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Hi, as you say, it is possible that the data inside the Passport was corrupted. As a troubleshooting step, be sure to use the USB cable that came bundled with the Passport and avoid using any USB extension cables or USB hubs. If the problem continues you can try using a data recovery program, with the help of Google you should be able to find several options.