Patent ID: 11874737
Assignee: SILICON MOTION, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  Y | IPC G

Claim 0:
1. A selecting bad data column method, applied to a data storage device, wherein the data storage device comprises a control unit and a data storage medium, and the data storage medium comprises a plurality of data columns, and the control unit executes the selecting bad data column method comprising:
reading written data of each data column as read data;
comparing the read data and the written data of each data column to calculate an average number of error bits of each data column;
determining whether the average number of error bits of each data column is greater than or equal to a predetermined value; and
recording a data column as a bad data column when the average number of error bits of the data column is greater than or equal to the predetermined value;
wherein, the predetermined value is an average number of error bits that can be corrected by an error correction code of the data storage device.