Please help fast.. Osx merged 2 hard drives, how to un-merge?!?

[Shirley_C]

I am selling off my Mac mini and during the drive formatting the power cut out. Upon restart it asked me if I want to 'fix' the hard drives to work again and now they have been merged into one partition. Any advice how to undo this?

 

[Fishrrman]

Tell us more about the Mini, including which drives are inside it.

Sounds to me like you have both an HDD -and- an SSD, and Disk Utility has assumed that they're suppoed to be "fused" into a fusion drive, and did just that during the re-initialization process...