I want to clean install a new version of OS X, so I was thinking to create a separate partition, transfer all applications and settings from my old system and then remove the old partition and make a new one the only one.
But when I created a separate partition for El Capitan, I realized it is not possible to resize it or remove the original one. Here is a message I get from Disk Utility: "You can only merge this partition with the one before it. To do it, click -" When I click "-", all data will be erased and free space merged into the first partition.
And from the Terminal:
/dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *500.3 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_CoreStorage 427.1 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s5 4: Apple_HFS El Capitan 72.2 GB disk0s4 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Macintosh HD *426.8 GB disk1 Logical Volume on disk0s2 991EF790-B05D-45BB-B326-6CDC7D75A172 Unencrypted