A medical monitor is disclosed for implantation in a human body for monitoring biological activity and states as detected by implanted sensors. The medical monitor includes at least one hard disk drive an enclosure surrounding the at least one hard disk drive, and a transmitter and receiver for producing and transmitting signals. The medical monitor is in communication with the sensors, by which information on biological activity and states is stored on the at least one hard disk drive, wherein transmissions are encrypted as encrypted information for security of the user.