Wd elements - chkdsk reports unspecified error

It seems that some of the files in the Elements are corrupted. Remember to always safely eject the Elements before disconnecting it from the PC or the WDTV. You can try backing up all of your files and then format the Elements. To rule out any possible hardware damage you can also run a DLG test. 

How to test a drive for problems using Data Lifeguard Diagnostics for Windows