I had problems with the Fusion drive, ended up reformatting it, and reinstalling HS. I never actually intended to split the drive, but it looks like I did. Now it boots again to HS but in disk utility it shows the SSD as an unmounted APFS Physical Store and diskutil shows this. any suggestions as the best way to proceed. I know some try to split the drive on purpose, what advantages would I have to leave it. The more I read about these APFS drives, the more conflicting info I find.