Currently Being ModeratedMar 31, 2013 11:44 PM (in response to pamelarandwick)
... It needs sto be formatted for Mac ...
Usually if you are Only intend to use it with a Mac it should be Formatted Mac OS Extended (journaled)
More Info here on Formats > http://pondini.org/OSX/DU8.html
To Format the Drive using Disc Utility... See Here...
From Pondinis Excellent Information here...
Currently Being ModeratedApr 15, 2013 3:47 AM (in response to pamelarandwick)
Many thanks AnaMusic, it seems to have solved my problem although I'm a little worried that Time Machine is becoming quite erratic. Sometimes backs up OK then inexplicably wont uness I eject my external hard drive then connect it again