Chosen Solution

Hello, in the Apple Store in Frankfurt/Germany I have seen in the “about this Mac” that the 27" iMac shown there has had 2 Storages: one 1TB HD and one 256 GB SSD. How is this possible? I did not find anything about this KR Steve

All of the ‘Thin Series’ iMac’s have two storage interfaces. What likely confused you here is the older SATA drive interface which there is only one in these systems. The second interface is a custom Apple PCIe blade SSD. Here is an image of it (the person is taking it out):

I must warn you this drive is not easy to get to so adding it is a bear! And to add to that you need the custom Apple part as it’s not a standard M.2 SSD (similar but different). So far the part is only available from Apple (and only as an exchange swap out, you need to return the old one, which clearly you don’t have here).