you might need to initialize it first:
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Control Panel\All Control Panel Items\Administrative Tools\Computer Management
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Storage → Disk Management
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Looks for you drive in the lower section and rightclick on it where it says “Disk XX” (XX being the number of your drive windows assigned to it)
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Then select “Initialize Disk” like in the picture:
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Just continue clicking next/continue/ok till the window disappears.
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Check “My Computer” again
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if it still doesnt show up, rightclick on the part where it says “unallocated” and assign a new drive letter (“Change drive letters and paths”)