Gregg, Post-Sierra Disk Utility adds support for APFS, which is incompatible with everything previous. It also adds the concept of "containers" to volumes.
I keep a Snow Leopard (10.6.8) system around for just such purposes. Its Disk Utility is very reliable, whereas the new Disk Utility has failed many times to do The Right Thing™️. -Carl > On Dec 21, 2018, at 9:15 AM, Dinse, Gregg (NIH/NIEHS) [C] > <di...@niehs.nih.gov> wrote: > > I did not even think of that (APFS). Is there an option to choose either APFS > or HFS+? This was on a laptop running High Sierra. Of course, I never even > got to the point where I could start the partitioning process, much less > choose the file system, since the Partition button was gray. > > Thanks, > > Gregg > > From: Macs R We <macs...@macsrwe.com> > Date: Friday, December 21, 2018 at 11:09 AM > To: "Dinse, Gregg (NIH/NIEHS) [C]" <di...@niehs.nih.gov> > Cc: "macosx-talk@omnigroup.com" <macosx-talk@omnigroup.com> > Subject: Re: unable to partition external SSD > > 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] >> <di...@niehs.nih.gov <mailto:di...@niehs.nih.gov>> 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]" <di...@niehs.nih.gov >> <mailto:di...@niehs.nih.gov>> >> Date: Thursday, December 20, 2018 at 8:57 PM >> To: "macosx-talk@omnigroup.com <mailto:macosx-talk@omnigroup.com>" >> <macosx-talk@omnigroup.com <mailto:macosx-talk@omnigroup.com>> >> Cc: "Dinse, Gregg (NIH/NIEHS) [C]" <di...@niehs.nih.gov >> <mailto:di...@niehs.nih.gov>> >> 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 >> MacOSX-talk@omnigroup.com <mailto:MacOSX-talk@omnigroup.com> >> http://www.omnigroup.com/mailman/listinfo/macosx-talk >> <http://www.omnigroup.com/mailman/listinfo/macosx-talk> > > _______________________________________________ > MacOSX-talk mailing list > MacOSX-talk@omnigroup.com > http://www.omnigroup.com/mailman/listinfo/macosx-talk
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