New Seagate 1TB external hard drive is not being selected by MacBook Pro

My new Seagate 1TB external HD is not being identified by the MacBook Pro (10.7.5 Mac OSX). Whereas the same being recognized by a WIN8 OS based PC. I need a format wherby the external HD should be recognised by both Mac OS and Win.
Kindly help.
Pls note my system is being run on safe mode, as there is a problem in the left shif key. Hence, while booting, it is automatically being shifted to the safe mode. I need to format the external HD, so that I can transfer to store my data.

If you want the drive to be able to both read and write on OS X and a Windows machine, you should format the drive as exFAT on the Windows machine. As to why the drive is not recognized when you boot into Safe Mode, that may be because the drive is formatted for another OS and it MAY BE that it's disabled when you run in Safe Mode (which disables a long list of things: see -> http://support.apple.com/kb/HT1564?viewlocale=en_US).
If you format it as exFAT on the Windows machine, you MAY BE able to have it mount on your Mac. No guarantees, though.
Good luck,
Clinton

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