Patent ID: 7441127

Claim:
A portable contents player comprising: audio output means for outputting an audio signal to a set of external headphones; power detection means for detecting supply of a first power having a first power level and a second power having a second power level lower than the first power level; storage means for storing data in a storage medium; supply power switch means for supplying the storage means with the first power when the power detection means detects supply of the first power, and supplying the storage means with the second power after switching power from the first power to the second power when the power detection means detects supply of the second power only; and data transfer rate control means for setting a data transfer rate between a predetermined data transfer source or data transfer destination and the storage means to a second data transfer rate lower than a first data transfer rate when only the supply of the second power is detected, to thereby reduce power consumption of the storage means in comparison to power consumed by a data transfer performed at the first data transfer rate, wherein the data transfer rate control means sets the first data transfer rate before the data transfer at the first data transfer rate is started when the power detection means detects supply of the first power, and maintains the first data transfer rate even if the first power ceases to be supplied after the data transfer starts.