USB Mass Storage not getting detected

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http://forum.xda-developers.com – So this is weird. I have two nexus s devices. One device is detected by my windows laptop as usb mass storage device just fine and I can browse my /sdcard just fine. My other nexus s is not detected as usb mass storage device, only as ADB interface so I cannot browse my /sdcard in windows. I thought it was the phone so I plugged it into my ubuntu laptop and ubuntu detects the usb mass storage just fine and opens /sdcard. Can anybody help me understand what is going on here? Should I uninstall the adb drivers from windows and try again? Maybe if I uninstall the adb drivers windows doesn't get c (HowTos)