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I have a big external drive that's already in use by my Windows computer. I also need to use it for a Time Machine backup of a Mac.

So far I've partitioned it up with MiniTools Partition Wizard. However, the Mac only recognizes the first original partition with my Windows data. The new partition is visible and size-measured in Disk Utility, but it's greyed out, without a name and I can't run any action on it. Time Machine is not able to format it either of course.

How can I make it so that the Mac can operate on the new partition?

EDIT: Here are some pictures from MiniTool and Disk Utility.

MiniTools on Windows:

Disk Utility on Mac. Notice the second partition is greyed out: Disk Utility

Clicking in on the greyed out partition shows that it's "not activated" ("ikke aktivert" in Norwegian). However, it's not possible to activate it: enter image description here

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Using GParted Live to format the new partition to HFS+ did the trick.

Thanks to user SPRBRN.

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