How do I reformat my Seagate Expansion external hard drive so I can use it for Mac

I recently purchased a 3TB Seagate® Expansion® external hard drive for PC. My plan is too reformat it so that I can use it, but it has been acting wierd on me. It says on Disk Utility that it is 4 gbs but I have a 3TB one. Im on OSX mavericks by the way. Thanks!

akostainsek,
the diskutil output shows that the disk has no Apple-recognized partitioning. Try the following commands in Terminal to establish the partitioning, and to see if it takes effect:
diskutil eraseDisk JHFS+ Seagate disk1
diskutil list
Again, please include in your reply the full output from these commands.

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