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Does anyone know if there is a drive cavity in a 2017 21.5" iMac to fit a full size HD (to possibly use a stacked pair of notebook size SSDs)? Also, do all logic boards for this iMac have the blade SSD slot? Considering adding both form factors but want to plan before opening…thanks to all!

This series offered one 3.5” SATA bay and one NVMe/PCIe blade drive bay. There is no means to add additional storage beyond this.