The 16TB product comes without an SSD inside, only a 16TB spinning drive which is slow and this combination this is overpriced. You are better off getting the unpopulated STX and purchasing a 16TB drive separately then you have some money over to put towards an M.2 SSD.
This should not be listed under External SSD.

Question

The 16TB  product comes without an SSD inside, only a 16TB spinning drive which is slow and this combination this is overpriced. You are better off getting the unpopulated STX and purchasing a 16TB drive separately then you have some money over to put towards an M.2 SSD.
This should not be listed under External SSD.

Answer

The product comes with 16T of SSD.

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Question about OWC miniStack STX 16.0TB for Mac mini