Abstract: In a track searching method for an optical disk drive such as CD-ROM and the like, when a search object time is given from a host computer, the number of tracks is which a difference between a present time, included in a discriminating information of track on which an optical pick-up is located, and the given searching object time is determined. In accordance with the detected number of tracks, an optical pick-up jumps. After, the number of tracks corresponding to a difference between a time included in a discriminating information of track and the above-mentioned searching object time is detected. Then, the ratio of the number of tracks to be jumped to the detected number of tracks of the difference is calculated. The ratio is accumulated in each track searching operation and its mean value is calculated. The mean value is used as revising coefficient on and after the second track searching.

Abstract: On loading a CD-ROM, which is a data recording medium, onto a reproducing device, a time information of a sub-code is read out, and then, a time information of a header is read out. In accordance with a difference between the time information of the sub-code and the time information of the header, an offset value is calculated and memorized. When a time information of a target header is given, by adding the offset value to the given time information of the header, a target time information is calculated, and a sub-code, which indicates a time information equal to the target time information, is searched as a target sub-code. On searching the target sub-code, a time information of the header is read out. By these operations, time for accessing is shorten, on being given the time information of the target header and searching the header.