Partition disk 2 TB external hard

I have an external HD 2 TB Seagate, which was initially set up with Windows 7 pro NTFS. I have about 400 GB of mainly video files that I want to save.  I'd like to partition the drive with the windows files and use about half of it for my Mac. I only use my Mac desktop / ElCapitan latest version since June of 2015 and gradually I got used.

And help with this would be greatly appreciated.  Please advise!


When you want to share a disk with Mac and PC, you must reformat the partition of the disk from scratch, so you must save video files on the other drive first.

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