Hierarchical classification data destruction method

The invention discloses a hierarchical and classified data destruction method, which comprises the following steps of: S1, preprocessing a data carrier, accessing the preprocessed data carrier into destruction inspection equipment, and acquiring a given processing level at the same time; S2, judging whether the stored data content can be identified and accessed or not, and executing corresponding steps according to the identified access condition; S3, releasing the hidden sectors, and carrying out sector scanning; S4, scanning a file structure to confirm a processing level; and S5, executing the destruction operation process according to different grades. According to the method, through preprocessing, access identification detection, sector scanning, content detection and cross classification and grading based on multiple dimensions, the data destruction efficiency and the resource utilization rate are improved, the accuracy of classification and grading is ensured, and the validity of data destruction and t