I cannot use my external hard drive -- it is an NAS drive shared with Windows-based PC that can read it with no problems.
When I open it shows the following message and then allows partial capability. Since my machine is a macboook Air, with limited internal storage, I had started using this drive for my main iTunes library. Now I cannot
HOW DO I "Check server messages????"
HOW DO I GET MY FULL DRIVE ACCESS BACK????
MacBook Air, Mac OS X (10.7.4), other Mac systems and Windows Vista