MY Passport Essential SE WDBACX5000ABK-01, 500gb

Hello and welcome to the WD Community.

Not sure why you are getting this.

My recommendation on this case is to check the drive with a data recovery softare to see if the rest of the unit can be found. If still the same after that, please contact WD Support directly.

WD Contact info:

http://support.wdc.com/country/index.asp?lang=en%22