I have Lion 10.7.5 and two partitions in my HDD but I would like to erase the second partition and merge to one full partition. I have tryied to erase with the - minus botton but it cant merge to only one 500 Gb partition. What to do?
You should be able to drag the partition down to consolidate it. then click "Partition".
You DO have a backup, right?
I would make a backup with SuperDuper or CCC onto another drive, format the original drive as one partition, and then copy the backup back over onto the new partition....