Time Machine and Seagate External hard drive

I connected my Seagate External Hard Drive (300GB) to my MacBook pro for the first time. I got a prompt asking if I would like to use this as a backup disk with Time Machine. Absent-mindedly, I hit "NO".
Now the Hard drive is not showing up in the list of disks in Time Machine and I can't figure out a way to search for new disks or change the settings. I would like to use the hard drive to back up my Mac.
(Also, my Mac has a Windows partition) and I have used Norton to backup the Windows side on the same hard drive.)
Any suggestions?

MG1373 wrote:
(Also, my Mac has a Windows partition) and I have used Norton to backup the Windows side on the same hard drive.)
Hi, and welcome to the forums.
Do you mean there's already Windoze data on the external you want to use for Time Machine? If so, this probably isn't going to work. The external is almost certainly set up with the MBR (Master Boot Record) partition scheme, which will not work for TM backups. To check this, use Disk Utility (in your Applications/Utilities folder). Click the top line of the drive (with the make and size), then look at the bottom of the display for *Partition Map Scheme.*
If it is MBR, the only way you can put a partition for Time Machine on this drive is to erase it completely and reformat it with the GUID partition map scheme (unless it's a PPC Mac, which needs the +Apple Partition Map+ scheme), then make 2 (or more) partitions, one formatted +Mac OS Extended (Journaled)+ for TM.
If you do that, you may not be able to set up a partition that you can use for the Windoze data. I don't do Windoze, so can't be sure about that.

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