To prevent impact of a protrusion, to further reduce a processing cost of a plain USB module, to further reduce size, to specify no insertion direction, and to facilitate transfer.

The data storage card is for a universal serial bus (USB) standard electronic device. The data storage card has the plain USB module, a storage module, and a microcontroller. The plain USB module is symmetrically formed on a circuit board for connecting the USB standard electronic device. The storage module is provided on the circuit board, and it is connected to the plain USB module for storing data. The microcontroller is provided on the circuit board, and it is connected to the storage module between the storage module and the USB standard electronic device for controlling writing and reading of data of the storage module. In such a manner, the storage card is arranged in the USB standard electronic device without specifying the insertion direction.