Fix Partition Issues in Mac OS X When Disk Utility Doesn't Help
Next, we'll see how we can perform disk partitioning as well as how to split, merge and erase ones created. Back in my days on the Genius Bar, we would use the command-line to create external diagnostic drives that contained multiple volumes. We'd usually need at least of these drives at any one time and they all had to be identical, so every month each drive would be reset. To automate the process and guarantee that each drive created was exactly the same, a shell script would automatically split a drive into the desired number of partitions then restore various versions of OS X and diagnostic software automatically.
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This level of automation is simply not possible with Disk Utility, demonstrating how the command-line can be more useful. At the end of the command is the argument 0b. This represents the size of the partition to create. You can specify any size you wish, up to the maximum size of the free space available, using b bytes , m megabytes , g gigabytes and so-on. So the command to run will repartition a hard disk identified as disk2 with GUID Partition Table containing a single volume called New that spans the entire disk.
Using the same command, we partition a hard disk with multiple partitions and formatting them as useable volumes.
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If the total size of all volumes is less than the space on the hard disk you're wanting to partition, the remaining space will be left as free. If we tried to perform the same task within Disk Utility, we'd first need to specify the number of partitions from the drop down menu.
Then, select each one and name it while making sure we specify the size required. One limitation of Disk Utility is that the graphical interface can only partition a disk with up to 16 partitions. The command-line, however, has no such limitation and can be used to create as many partitions as required. Disk partitions can be split into multiple, smaller ones using splitPartition , with a similar command to partitioning a disk.
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The option requires the use of a a partition's disk identifier before creating the partitions with the usage convention mentioned earlier:. Now you need to find out what size your new partition can be. This will return the current size of the partition, as well as the minimum and maximum sizes you can use.
For example:. For device disk2s2 Untitled: Current size: bytes Minimum size: bytes Maximum size: bytes.
Top 6 Partition Managers (CLI + GUI) for Linux
It should follow this basic model:. The first part of the command is, of course, the command itself: diskutil resizeVolume. Type in the size you want this partition to be, not what it currently is. So, for example, if you want the first partition to be GB, specify G. Finally, specify the format, name of your choosing, and size for the partition you want to create. Want more than two partitions?
Find Out The Partition Table Type
Just add additional arguments to your command. For each additional partition you wish to create, you must specify the format you want it to adopt. You must specify the size for each partition. You cannot create a bootable partition for Boot Camp using this command.
Here is how to Partition a disk
To make a bootable partition for Windows, you must use the Boot Camp Assistant or partition your disk with the diskutil partitionDisk command, which will destroy all data on it. Type man diskutil in Terminal for more information on this command. This command splits a single partition in two. It specifies a size of GB for the first partition. So if you split a GB partition, the above command would give you a first partition of GB and a second partition of GB.