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
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