Wednesday, October 12th, 2016 Author:At the end of September, the Rocket Yard gave you the scoop on the new version of Disk Utility that is now in macOS Sierra. While we got into, we didn’t cover the new partitioning tool. In this article, we’ll take a look at how to partition and erase drives using macOS Sierra’s updated Disk Utility.Why Partition?Partitioning a drive essentially breaks it up into distinct, named regions so that an operating system like macOS can manage information in each of those regions separately. Partitioning is usually done before installation of an operating system; in most cases, Apple and other computer manufacturers tend to leave the drive as one big partition. So why would you want to divide a drive into two or more partitions?. Separating macOS and application files from user files, which means that clones of the operating system and apps can be made separate of the documents created by the Mac. Creating a multi-boot setup, with different operating systems on the same computer.
When using Apple’s Boot Camp environment, two partitions are set up — one for macOS,. At startup, it’s possible to select which operating system is to be loaded. Running beta operating systems in their own boot partition. During the macOS Sierra beta, my “test machine” was partitioned with Mac OS X El Capitan on one partition and on another.Launching Disk Utilitycan be launched several different ways.
First, one can go to Finder Go Utilities, then double-click on the Disk Utility icon. Next, there’s a keyboard shortcut to get to the Utilities folder — Command + Shift + U from the Finder.
Or, since you’re running macOS Sierra, you can just click on the Siri icon and say “Launch Disk Utility”.The partition tool is one of six buttons at the top of the Disk Utility window (see image below). If it’s not currently highlighted, it’s because Disk Utility usually shows the current Mac volume information, not the Mac disk information. (Disk Utility, with the Partition button highlighted)As you can see above, I’ve gone ahead and clicked on the drive named “Fusion Drive” — it’s currently partitioned into one big volume called “Macintosh HD”.The Partition ToolWith the drive (not the volume) selected, clicking on the Partition button displays this window:The big blue circle indicates the Fusion Drive in this iMac, and there’s currently just one partition and logical volume that makes up the whole of the drive — Macintosh HD, at 2.12 TB.
See that crosshatched area on the right side of the “pie chart” circle? That indicates just how much space is currently in use on the Mac — exactly half of the 2.12 TB capacity.Before we start looking at some of the ways the partition tool can be used, it’s important to know what you should not use the tool for — setting up a Boot Camp partition.
Cannot Partition Usb Drive Mac Pro
That needs to be done using the Boot Camp Assistant app that is also found in the Applications Utilities folder.Adding a volume to a device without erasing existing dataLet’s say we want to add a partition to this iMac for the purpose of running an older version of Mac OS X. Here’s what you do:1) Select the drive by clicking on it, then click the Partition button.2) Click the Add button ( + ) below the “pie chart”.
By default, this splits the volume into two equally-sized partitions. The first has the name “Macintosh HD” that was created when the Mac was first set up, while the other has the vague name “Untitled” (see image below).Note that if the existing volume is less than half-full, Disk Utility creates two volumes of the same size. If the volume is more than half-full, it creates one volume large enough for the existing data and another volume with the remaining space.3) Name the volume in the “pie chart”.
Click on the Untitled portion of the “pie” and then type a new name for the partition into the Name field to the right of the “pie”.For example, the new partition could be given the name ElCapitan. There’s also a pop-up menu for changing the format of the partition. It can be Mac OS Extended (Journaled) — the default for a Mac partition — Mac OS Extended (Journaled, Encrypted), Mac OS Extended (Case-Sensitive, Journaled), Mac OS Extended (Case-Sensitive, Journaled, Encrypted), ExFAT (Extended File Allocation Table, a Microsoft files system used for USB flash drives and SD cards), and MS-DOS (FAT).As mentioned before, if you’re going to create a Windows Boot Camp partition, be sure to use Boot Camp Assistant.
Change Partition On Usb Drive
If you’re creating a partition that will contain another operating system — perhaps some flavor of Linux, for example — check with the operating system’s documentation to see what format is best.4) Change the size of the partition if necessary. To do this, you can either grab the “dot” located between the partitions in the “pie chart” and move it left or right, or you can type a size into the size field.5) Click “Apply”. This will create the new partition in seconds. There’s a “Show Details” button that can be clicked to view the process of creating the new volume if you wish.6) When the new volume is created, click Done.Enlarge a volumeYou can also enlarge a volume without losing the files on it. This is useful if you have multiple volumes on a device and have one that’s running out of space.One caveat here: to enlarge a volume, the volume that comes after it on the device must be deleted; you can’t delete the last volume on a device.
So this basically works if you have more than two volumes. OSX iMac with 10.13.3Just purchased a 2TB OWC elite proSSD external. Used OWC to partition into 2 volumes.Ran Super Duper backup to one volume. When I went to backup different source to 2nd volume, that 2nd volume has disappeared. Since I had not deleted original backup drives (2X 7200’s), I ran erase on new drive with DiskU, aiming to try partition again, but with disk utility.Erased to OSX extjournal successfully.Only problem is that after erase, partition option is grayed out.What gives? This is not rocket science to partition a drive.
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Sundy1 wrote:Hi guys,Scoured the net for an existing solution to this problem, but to no avail.I'm attempting to partition a 500gb external HDD to run bootcamp, but whenever I go into Disk Utility, the option to partition the drive is greyed out.I've previously erased and formatted to Mac OS X Journaled, so there's nothing on it, but still the partition option isn't available (see screenshot).Any help is majorly appreciated. Thanks in advance!This drive has been formatted as FAT (MS-DOS), for Microsoft.
You have to erase it, to give it a new partition table. (GUID for OS X Journaled)Leo. Any help is majorly appreciated. Thanks in advance!This drive has been formatted as FAT (MS-DOS), for Microsoft. You have to erase it, to give it a new partition table. (GUID for OS X Journaled)LeoHey Leo,Thanks for the reply.
I know the screenshot reads MS-DOS, but I have in fact already erased as OS X Journaled, hence the confusion as to why the screenshot that appears on this forum appears different (really strange). Here's what I got when I took your advice in running through terminal:Hope that helps and thanks in advance!Tom. Thank you so much and I wish I had found your answer yesterday! I spent so much time before finding your solution that worked.
After following your instructions and pressing partition from the main listing of my hard drive in disk utilities, I got a message saying I needed to click the external option of my hard drive (which was the listing under the main hard drive) 'file' and 'enable journaling.' After doing that the partition option was no longer greyed out and I was able to successfully partition the drive. Hi guys, sorry for highjacking the post, but since the problem was already solved, I thought you wouldn't mind.I had the same problem and used the command posted here on terminal, but still can't partition my external HDD. Apple Footer.This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums.
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