No Storage Present

I have the same problem using two different external Portable drives (Seagate Free Agent & Seagate Expansion). Initially these drives were recognised and I was able to view (Video) and listen (Music) to content recorded on them. However, after disconnecting to add content and reconnecting I was encountered with the No Storage problem reported by others.

I add to their postings simply to reinforce that this does not seem to be a unique problem affecting one or two individuals and calls for some attention. 

How did you disconnect them from the SMP? How did you disconnect them from your PC? If it’s not done correctly it will cause problems.