Question Second Drive Not booting (showing up)

Apr 18, 2020
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Hey guys New to the fourms, I recently upgraded my desktop pc to a ssd, in doing so i switched to achi, I cloned the hd to ssd but forgot to format the hdd, I would like to use the hdd as a secondary external drive but it is not showing up any where (my pc, disk management, or in 3rd party programs Killdisk) id there anything i can do to get my hdd to be recongnized, Thanks in Advance and stay safe out there