External HD not recognised!

Hi folks
I've tried and searched discussions for help but........ Anyway can someone pls help as I have an 1TB Seagate FreeAgent GoFlex and want to use it as my Time Machine but it cant be verified, erased, partioned etc etc. Its not recognised in Finder either.  Can someone pls HELP!!!  (Thnx in advance)

Thnx for the replies;
I have tried a different usb but nothing; The ext. HD is a year or so old.
The drive does show up in Disk Utility and states that S.M.A.R.T. Status not supported and also Partition is not formatted but as stated I cant do this!!! Ta

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