Local-storage device with high-capacity and high-reliability

The utility model discloses a local-storage device with high-capacity and high-reliability. A power source supplies power for a central processing unit and a flash storage device. The power source also supplies power for hard disks through a power supply controlling circuit. The central processing unit is connected with the flash storage device and the hard disks through a data bus. The central processing unit detects a network state, and sends controlling signals to the power supply controlling circuit. Power supply states of the hard disks are controlled by the power supply controlling circuit. Storage media of the local-storage device comprise the flash storage device served as a buffer memory and at least two hard disks. The flash storage device is served as the buffer memory so that data can be buffer-stored firstly in the process of alternate power-on response of the hard disks. When the hard disks work regularly, the buffer-stored data are stored in the hard disks, and therefore the data can not lose.