A storage device is provided. The storage device includes a first connector, a second connector, and a memory circuit. The first connector is selectively electrically connected to a first electronic device. The second connector is selectively electrically connected to a second electronic device. The memory circuit is disposed between the first connector and the second connector. When the first connector is electrically connected to a first electronic device and the second connector is electrically connected to a second electronic device, the second connector is switched to a charge mode from a device mode, so that the first electronic device charges the second electronic device through the storage device, the second electronic device does not provide power to the storage device through the storage device, and the first electronic device accesses data in the storage device through the first connector.