Creating new partitions on the Mac is really easy one. Also you can resize, delete, merge partions from any internal and external hard drives in Mac OS X. Its have a default partition manger app named Disk Utility. Before doing these steps make sure you have a full backup of your hard drive important files and documents. Also you can backup your hard drive using Time Machine. How to create/add a new hard drive partion in Mac OS X

  • Open Disk Utility app from /Applications/Utilities/.
  • From the left side of the app, select the hard drive you want to partition.
  • Choose the “Partition’ tab.
  • Press the (+) button to create a new partition.
  • Provide a name for your new partition, choose the filesystem type (By default it have Mac OS Extended Journaled) and select a size either by dragging the slider in the partion map or enter manually.
  • Press the “Apply” button to create a new partition.

SEE ALSO : 6 Best Partition Management Software for Mac How to delete/merge a partition  Deleting a partion is really easy as creating one. Follow the same method to add a new partition, choose the partition you want to delete, and press (-) button. Press the “Apply” button for changes effect. Note : If you delete a existing portition, you will lose data that exists on it. How to resize/enlarge existing partitions  Resizing partition feature allow you to grow or shrink your portition size.

  • On the “Partitions” tab, drag the separator bar up and down to resize your hard drive partition.
  • Alternatively, select the partion you want to resize. Enter size value in GB in Size box.
  • Click the “Apply” button to resize the partition.

Your MacBook does not need any reboot to apply these changes.