Following the forum posts, originally everyone said that there was an hardware limitation for connecting n900 usb external drives because there was only a Micro-B usb port on the device instead of a Micro-AB usb port to allow USB OTG (acting as a host and slave).
Kasunod ng mga post sa forum, Orihinal na lahat ng tao sinabi na nagkaroon ng hardware limitasyon para sa pagkonekta n900 USB panlabas na nag-mamaneho dahil nagkaroon lamang ng isang Micro-B USB port sa device sa halip ng isang Micro-AB USB port upang payagan ang USB OTG (kumikilos bilang isang host at alipin).