Weird. If it shows-up in Device Manager, it should show up in the BIOS SETUP.
Is it "brand-new" ? If so, hold-down the "Windows" key on the keyboard, tap an "R", and release both keys.
Type diskmgmt.msc and press Enter.
You may need to select and "initialize" the device, and "quick-format" the device, and assign a drive-letter, before File Manager can show it.