My passport essential se 1 tb all folders empty

First time I attached My Passport essential to my CPU and after clicking SmartWare and started backing up my files.  After 20 minutes a brownout happens.  Now My passport has empty folder including the user manuals.  I also backed up some data from an old hard drive and that folder is also empty.  What shoud I do?  My Passport shows it has 872GB free space from an original 931GB total free space.  Are my data still there?  Windows give a message Windows - Delay Write Failed

MGY510, perhaps the following article might be of some help:

Answer ID 934 - Error: DELAYED WRITE ERROR using an external hard drive in Windows