If you want to create a new partition in Mac OS X, you won’t need to use anything fancy other than the built-in Disk Utility. Be sure to have a full backup of your hard drive before adjusting the partition table just in case something goes wrong. If you have an adequate backup, proceed:
Add a new hard drive partition in Mac OS X
- Launch Disk Utility from /Applications/Utilities/
- Select the hard disk you want to partition from the left side of the app
- Click on the “Partition” tab
- Click on the + button to add a new partition
- Specify a name for the new partition, select a filesystem type (Mac OS Extended Journaled is default), and choose a size either by manually entering a capacity or by dragging the slider bar in the partition map
- Click on “Apply” to create the new partition
You can make partitions any size as long as you have the available disk space to accommodate it, and creating the partition shouldn’t affect your existing filesystem either as long as there is free space. Nonetheless, there is always a chance something could go wrong, which is why I recommended you backup your drive first.
After you have clicked ‘Apply’ to create the new partition, it will be immediately accessible in the Finder to use how you want. A new partition will behave like a new hard drive, and it will appear on your Desktop as a new drive which can be ejected, mounted, formatted, just like a hard disk.
I partitioned my drive before installing Mac OS X Lion so that I could maintain my stable Mac OS X 10.6 system software while still exploring the Lion 10.7 Developer Preview. Another common use is to partition large external hard drives for a specific Time Machine backup partition. Time Machine will backup a drive until the available space is taken, so if you set it to backup to a partition, it will only take up that space and leave the other partition alone, allowing the drive to serve multiple uses.
Deleting a partition
Removing partitions is just as easy as creating one. All you need to do is follow the steps above to get to the partition table, select the partition you want to delete, and then click the “-” button rather than the plus icon. Remember, if you delete a partition, you will lose data that exists on it.
Removing partitions is just as easy as creating one. All you need to do is follow the steps above to get to the partition table, select the partition you want to delete, and then click the “-” button rather than the plus icon. Remember, if you delete a partition, you will lose data that exists on it.
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