If its not showing up in windows as a drive but is in the hardware tabs then it seems your partitions may be messed up. You may need to find a non-destructive partitioning tool.
Try going to admin tools in the controll pannel, select "computer management" and from that select "disk management".
This will show you exactly what windows is seeing in terms of partitions on all your drives. If the partition is there try assining a drive letter to it.
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