You didn't say what OS you are on. If you re on Mojave (or possibly HIgh Sierra), it may have decided to format your drive as APFS, under which partitioning is quite a different animal. Specifying HFS+ in the terminal command would have reformatted it.
> On Dec 20, 2018, at 8:50 PM, Dinse, Gregg (NIH/NIEHS) [C] > <[email protected]> wrote: > > Hello again, > > I found an answer to my question. I googled and found the following command, > which seems to have worked: > > diskutil partitionDisk disk2 1 GPT HFS+ newdisk R > > I ran this in a Terminal window, where my SSD is "disk2" (as seen in Disk > Utility) and "newdisk" is the name I gave to the single resulting partition. > Now when I go into Disk Utility, the Partition button is no longer gray, so I > assume that I can now create multiple partitions. > > Gregg > > From: "Dinse, Gregg (NIH/NIEHS) [C]" <[email protected]> > Date: Thursday, December 20, 2018 at 8:57 PM > To: "[email protected]" <[email protected]> > Cc: "Dinse, Gregg (NIH/NIEHS) [C]" <[email protected]> > Subject: unable to partition external SSD > > Hi, > > I just bought a 500-GB external SSD (Samsung T5). It was originally in EX-FAT > format, but I used Disk Utility to reformat as MacOS. I would like to > partition this SSD, but the partition button in Disk Utility is gray. The > other buttons (First Aid, Erase, Restore, Unmount) are all available, but not > the Partition button. How can I create multiple partitions on this SSD? > > Thanks in advance for any help you can provide. > > Gregg > > _______________________________________________ > MacOSX-talk mailing list > [email protected] > http://www.omnigroup.com/mailman/listinfo/macosx-talk
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