Hi Eagle. I'm Greg, an installation specialist and 9 year Windows MVP here to help you.
Was the drive plugged in when you Reset Windows? Did you do the deep clean reset?
Have you tried the drive in another PC?
Look over the suggestions here: https://www.easeus.com/resource/disk-unknown-no...
If it wasn't wiped then you can try a Partition Recovery software like this one that has saved other drives that weren't formatted but lost their partitions:
http://www.partitionwizard.com/help/partition-r...
If that doesn't work then you can try Data Recovery software like this free starter program: http://www.piriform.com/recuva/features
I hope this helps. Feel free to ask back any questions and keep me posted. If you'll wait to rate whether my post helped you, I will keep working with you until it's resolved.
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