Chosen Solution
Context: MacBook Air (mid 2012), OS X El Captain version 10.11 256GB SSD split into a 30GB partition (OS X el capitan, name is “Macintosh HD”) and a 50GB partition (used to be BootCamp, name is now “B”). The 25GB partition needs to go. I have erased the 25GB to an OS X extended (Journaled) partition, but when I click on partition, I still cannot remove it (the infamous “minus greyed out”, see image). I can resize it, but Macintosh HD stays at 35GB, and a third partition is made which in turn can be removed, but the space it liberated is allocated to B again, which doesn’t solve anything. Please tell me how I can solve this problem?
Before you go in the terminal way, you must take the complete data backup of your Mac since a single wrong command line will invite new trouble and your complete Macintosh hard drive can now be unrecognized. Other way round will be using a partition manager utility by creating a bootable USB and then resizing / creating / deleting partitions. You may look at below mentioned apps partitioning your Mac:
- Stellar Partition Manager
- iPartiton
