A recording medium structure capable of displaying a defect rate is provided. The recording medium has at least one use area with endurance blocks, and each endurance block has an endurance value. The recording medium structure has a housing, a first and a second off-line display units arranged on the housing for respectively displaying a real defect rate and a potential defect rate of the recording medium. The real defect rate is calculated based on an error correction coed, and the potential defect rate is calculated based on an endurance values recorded in the endurance table.