Abstract: A mobile digital video recorder (MDVR) has a hollow shell, two board tracks, two brackets, a main board, power board, VSM board, and a storage device. The board tracks and the brackets are attached securely in the shell. The main board is mounted slidably and detachably in the shell via the tracks. The power board is mounted slidably and detachably in the shell via the tracks. The VSM board is mounted slidably and detachably in the shell via the tracks. The storage device is mounted slidably and detachably in the shell via the brackets. Therefore, the main board, power board, VSM board and the storage device are easily pulled out from the shell for repairing, replacing, or upgrading to new technology.