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hi,
is it possible to create a Fusion Drive from 512GB SSD and 500GB HDD?
i have a Mac mini 2012

I would concur with @Fishrrman that you’re slowing things down needlessly. Simply keep them separate and manage the data that you save to the HDD. Fusion is okay when it comes that way, but I would not complicate your build by doing it voluntarily.
 
Why do you ask - do you already have both drives?

I would avoid using a fusion drive. My mini had one and, over time, the mechanical one began to fail. In the case with a fusion drive, if either of them fails then you're in deep do-do.

After Apple confirmed my spinning drive was the issue, I opted to put two SSDs in my 2012 and have been extremely happy.
 
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