Mac disk utility partition greyed out external hard drive

MAC DISK UTILITY PARTITION GREYED OUT EXTERNAL HARD DRIVE MODS
MAC DISK UTILITY PARTITION GREYED OUT EXTERNAL HARD DRIVE PLUS

However, once I did that, I'd partition the HDD, so that I could auto-backup my Mac onto one partition (the computer has 121 Gig flash storage, so I suppose I would need a separate partition of around 130 Gig? Or 150?) And then the rest of the space on the HDD I could leave for photos and such?Р”Р„nyways, I go to the Partition button of the Disk Utility, and while I CAN click on the Partition, the plus + and minus - buttons underneath the big blue circle are grayed out! I can't click on them.

I looked online and several places recommended that, for the HDD to work both with PCs and Macs, I should format it with exFAT and with a GUID Partition Map, which I did, both using the Disk Utility on my Mac. I just bought a brand new Western Digital External Hard Drive, 2 Tb. Special thanks for the CSS from its creators at /r/Apple: /u/Xapher19, and /u/gouch23!

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MAC DISK UTILITY PARTITION GREYED OUT EXTERNAL HARD DRIVE MODS

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Mac disk utility partition greyed out external hard drive