Help 
The volumes don't even show up in disk management.
I have an external HDD that's in HTFS format and I can view that. It's only the internal SSD/HDD that I can't access.
2012 MacMini with SSD HDD fusion drive.
Win8 installed on a partition created using bootcamp.
One thing I suspect is that when installing win8, the installer wouldn't let me install in the partition created by bootcamp unless I reformatted it using the installer. Could that have been the problem?
The volumes don't even show up in disk management.
I have an external HDD that's in HTFS format and I can view that. It's only the internal SSD/HDD that I can't access.
2012 MacMini with SSD HDD fusion drive.
Win8 installed on a partition created using bootcamp.
One thing I suspect is that when installing win8, the installer wouldn't let me install in the partition created by bootcamp unless I reformatted it using the installer. Could that have been the problem?