Abstract: A hard disk drive having a single drive arm with multiple read-write heads for synchronous access to data, wherein the multiple read-write heads are used for synchronous access to shorten the access time of the hard disk drive and the data.

Abstract: An anti-eavesdropping system for mobile phone communication is disclosed, wherein a mobile phone is paired with a Bluetooth headset for voice data encryption and decryption, the Bluetooth headset having a microprocessor unit to perform encryption and decryption of voice data, wherein the Bluetooth headset transmits the encrypted voice data to the mobile phone, and decrypts the voice data from the mobile phone and outputs the decrypted voice data to a speaker.

Abstract: A storage device with multiple storage units, which is applicable to a system end. The storage device is a hard disk drive (HDD) or solid state disk (SSD) with a standard size. The storage device includes a first storage unit and at least one memory storage unit. The memory storage unit and the first storage unit serve to back up and update each other. The storage device further includes a multiplex control unit and a power control unit connected to the multiplex control unit. According to the decision of the multiplex control unit, the power control unit controls turning on/off of the first storage unit and the memory storage unit.

Abstract: A computer system includes at least a first and a second operating device and a control module. The control module sends at least one signal to a central processing unit for managing and controlling the first and the second operating device, and copying the contents of any one of the two operating devices to the other operating device, so that both of the first and second operating devices include an operating system, and the computer system can select any one of the first and second operating devices for booting the operating system and power off or power on the other non-selected operating device.