Abstract: An information reproduction apparatus is provided with: a drive device which rotates an information recording medium in order to read out predetermined information from the information recording medium; a reading device which reads out the information on the basis of commands issued from an external host; a measurement device which measures a command interval of the commands; and a rotation control device which controls a rotation speed of the driving device on the basis of the command interval measured by the measurement device.

Abstract: A transmission system S includes an MPU 11 that, when a data transmission error occurs, reduces a transmission speed to such a value as not to cause the transmission error to occur. The system S further includes a nonvolatile memory 16 that stores the reduced transmission speed. The MPU 11 detects a change in connection mode with a host H, and transmits data at the stored transmission speed when no change in connection mode is detected, and resets the transmission speed to an initial value to transmit the data at the initial value when a change in connection mode is detected.