My WD Passport wont allow files onto it

Hi,
I just bought this hard drive not too long ago and when i fist pluged it in it asked me if I wanted to sync my computer to it. I clicked no thinking I could just drag individual files over… Now it wont allow me to sync anything or drag anything over! 

Help!

Hello,

In order to provide better guidance please let us know the model number of your drive.

Also I will recommend some basic troubleshooting steps:

Try connecting the drive to another computer to verify if you have the same issue. Also what error message do you get when you try to drag a file to it?

As a last troubleshooting step you can try writing zeros to the drive using Western Digital’s Data Lifeguard Diagnostics tool.