Method and apparatus for determining type information of recording medium, and method and apparatus for recording/reproducing data in/from the recording medium

A method for determining type information of a recording medium, and a method and apparatus for recording/reproducing data in/from the recording medium using the method are disclosed. The method for determining the type information of the recording medium includes the steps of: a) determining type information of a recording medium classified according to position information of a recording layer contained in the recording medium; and b) determining type information of at least two recording mediums having the same recording layer position on the basis of a reflection signal received via a track cross operation. Therefore, the method can be applied to a fabrication process of a new optical recording/reproducing device for a high-density recording medium, and can effectively record/reproduce data in/from the recording medium.