I have Mac OS X Lion pre-installed on my 500 GB laptop hard drive. How can I safely install OS X Mountain Lion on the same drive and set up a dual-boot using Stellar Partition Manager without losing any data? Answer:
It is possible to run Mac OS X Lion and OS X Mountain Lion on the same machine without facing any potential problems. If you are running Mac OS X Lion on your laptop, you can easily install OS X Mountain Lion on the same drive by creating a second partition on the drive. However, your laptop drive should have sufficient free space to accommodate the new partition. You can resize the partition with OS X Lion pre-installed in order for creating new free space. To do so, follow the below mentioned steps using Stellar Partition Manager...Steps to install Mac OS X Mountain Lion on a preinstalled OS X Lion
Launch Stellar Partition Manager. Select your hard drive.
Choose the 'Macintosh HD' partition in the partition list.
You will see a graphical representation of the hard drive partitions. Reduce the size of the selected partition by simply dragging the slider upwards. Adjust the partition size according to your free space requirement. NOTE: You cannot reduce the partition size to less than that occupied by data.
Click 'Start' button and then 'Continue'.
Once the process is completed, you will see the resized partition in the middle pane.
To add a new partition, click 'Add' icon on the toolbar. The 'Add New Volume' dialog box appears on your screen.
Type in the desired volume name and specify the size for the partition by moving the slider.
button. You will see the respective task in the 'Task To Do' list in the right pane. Click on 'Start' to initiate the listed tasks.
A warning message box will appear on your screen. Click 'Continue'.
Once the process is completed, you will see the newly added partition in the middle pane. You can now begin installing OS X Mountain Lion on this partition.