How to merge 2 partitions on macOS I have an MBP running macOS High Sierra. There are 2 partitions. How can I get rid of BC1, and merge the space into Macintosh HD? Know very little about macOS. Please help. Thanks!
I think I got the answer. 


Open Disk Utility
Select the root of Internal drive on the left pane.
Click Partition button on the top pane.
Delete un-wanted partition(s). 


It's easy if you know!