hard disk not detecting
i have bougth a new seagate hard disk and when i connected it first it got connected and showed me settings to download. but after downloading i again removed and afterwards tried to connect it when i tried it didnt get recognised . it is not recognising from then but it is recognised on my pc. and my mac recognises my pen drives. so no prob with usb port nor the hard disk . so pease help me how can i make it detect in my mac running mountain lion macbook pro 2012 13 inch .
MacBook Pro