usb Ext HD not visible on desktop
hi i have a Bipra 500GB Ext HD which is connected by USB 2 port. i use his as my time machine backup disk
It was visible and working till last night
now i cannot see it on the desk top although it's visible if i looki in disk utility and it is powered up ok .
I can't see why it's invisible ,
Advice would be appreciated
Thanks
MacBook Pro, OS X Mavericks (10.9.5)