External Hard drive formatting problem

Hi there,
I have a Seagate GoFlex 2TB external Hard drive which was working well with my Dell Inspiron Desktop, the external drive Icon started disappearing from windows explorer and I decided to format it, I have Easeus partition master and when I completed formatting, I partitioned the drive but windows explorer can no longer find the drive, What could be the problem? How do I get this external drive working?
