Today I installed Mountain Lion after creating a partition on my Lion. After I booted into Mountain Lion partition, I went into Disk Utility and deleted the Lion partition(Thinking that all the free space will be added to Mountain Lion partition). Now I cannot enlarge the Mountain Lion partition now
Here is how it goes...
I want to increase the size of Mountain Lion partition. Please help ASAP!!
You can't resize a partition when it is in that bottom position like that.
What you need to do is add a partition back to the top 91GB area and format it to Mac OS Extended (Journaled). Then follow this video to use Disk Util to clone from the Mountain Lion partition to the new one on top. Once you have booted to that new partition and confirmed all is well, you can then delete the lower partition. Then resize the top partition to fill the space left at the bottom.
None of this will erase your data, but do a backup first just to be safe.
3. Launch CCC and clone the entire contents of the second partition to the first partition.
IMPORTANT: Be sure you have given the first partition a distinctive name so you can recognize it later.
4. Once the clone is complete, reboot to the first partition again.
5. Now, launch Disk Utility. Erase the contents of the second partition. Then, see if you can use DU to remove it.