Can't partition external drive under Mojave

[hologram]

Hi all, this is kind of weird...

Over the years I've had a few Buffalo external drives, and I've always been able to partition them using Disk Utility. I just got another one, brand new, 1tb and I want to break it up into 2 500gb partitions, but the "Partition" option in Disk Utility is greyed out.

I was able to reformat to Mac OS Extended Journaled, so there shouldn't be a problem. Should there? Any help would be greatly appreciated!

 

[CoastalOR]

Change the View (upper left in the Disk Utility window) to "Show All Devices". Then select the top level of the device, then you can Partition.

 

[hologram]

Thank you! ?

I've been using Macs for many years and I never knew that.
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I'm adding a reply in case you already read my previous...

It still doesn't work. It's still greyed out if I select the sub-level. Thanks, though (sigh).

EDIT again: I found out what the problem was. The top level was formatted as a Mster Boot Record, but I reformatted as GUID and now all is well. Thank you, you led me to the right place.

 

[getrealbro]

Your edit beat me to it...

On drives with a Master Boot Record Partition Map, I always Erase the disk and install the GUID Partition Map. Then I partition the drive.

GetRealBro

 

[CoastalOR]

I think the need to change the View in Disk Utility started with High Sierra (10.13).