Cascade data storage device

A cascade data storage device (1), comprising:

• At least an integrated circuit module (10) wherein the integrated circuit module (10) comprises:
• A substrate (11), at least an electronic device (12), a package body (13) and a USB metal contact (14) wherein the substrate (11) has an inner surface (111) and an outer surface (112), the electronic device (12) is installed on the inner surface (111) and electrically connected to the USB metal contact (14) of the outer surface (112);
• in addition, the package body (13) is used to encase the electronic device (12);
• A connecting structure (20) with at least a male connector (21) and at least a female connector (22);
• Characteristics as follows:
• The connecting structure (20) installed on a lateral edge (131) of the package body (13) allows the male connector (21) to couple with the female connector (22) and then the integrated circuit modules (10) freely connected, which are stacked high enough and keep the USB metal contact (14) electrically contact with a USB port (31) of a computer (3).