1TB WD hard drive issues on my macbook air

Hi, I bought a new 1 TB WD My Pssport Ultra hard drive to store movies and watch on TV. I cant copy my files to the drive.
In disk utilities, the drive format is 'MS-ODS (FAT), then when I change to MAC OS extended (journaled) and select 'Erase' it generates an error message - 'disk erase failed - couldnt unmount disk'.
Can you advise asap as my experience here is limited - thanks

Instead of Erase, go to the Partition Tab, select one partition (if that's what you need), and click the options button. Choose GUID partition table. Make it Mac OS Extended Journaled and try again.

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Good morning everybody! I'm apologize if this post is extremely wordy...
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_Brief history:_
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:D

1TB WD hard drive issues on my macbook air

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