Patent ID: 7496273

Claim:
A data recording apparatus comprising: a memory; a controller that carries out a recording operation of temporarily writing acquired information data onto said memory, and thereafter transferring the information data to at least one recording medium to record the information data; a data recording speed detecting device that detects a data recording speed at which the information data is recorded on the recording medium; a power-supply remaining quantity detecting device that detects a remaining quantity of a power supply for supplying power to the data recording apparatus; an expected driving time period detecting device that detects an expected driving time period for which the data recording apparatus can be driven, based on the detected remaining quantity of said power supply; a recordable data quantity calculating device that calculates a quantity of data recordable on the recording medium based on the detected data recording speed and the detected expected driving time period; and a data size changing device that changes a size of data to be written onto said memory based on the detected recordable quantity of data.