As removable storage medias are passive devices

their security policies depend on mechanisms in connected terminal systems

which will reduce the availability while providing security.This paper presents TRSF

a framework of removable storage based on trust virtual domain to implement active protection.TRSF solidifies a smart card and an isolation mechanism into the storage device and builds trust data channels from the device to the isolated usage environment in terminal system.So TRSF is able to provide trust virtual environment for data access and usage of removable storage even in untrust terminal systems by untrust processes.We implement an intelligent USB disk based on TRSF called UTrustDisk to evaluate the framework.The average overhead on read and write caused by trust chain mechanism is 7.5% and 11.5%.