How can I recover a deleted partition in El Capitan?

[iMore Question]

I tried to expand one partition to take up all available space. Instead, it contracted itself to 250 gb. How can I access the rest of the space available?

 

[mikeo007]

Is the rest of the space just unpartitioned space? If so, you should just be able to go into disk utility and tell it to grow the partition to use all available space.

Might be some useful info here: Disk Utility - Add, Delete, and Resize Existing Volumes