[Resolved]  Hitachi — Rather than complaint it a querry for the help

Hi am using the 500GB harddisk form the Hitachi S/N 71GGLB8C my disk didnt read and i couldnot retriive my valuable information from this. so i would like to request you suggest me the ways how could i resolve this problem. The device when connected in compter shows the device connected in the USB Port but it doesnot load in the my computer. Pls provide me the assistance to get those datas from the device. Pls waiting for your response soon