Abstract: A data storage device with a recording medium for which a data erase function unit is introduced to achieve both partial non-erasure of data for analyzing a cause of data error and full erasure of data for protection of personal information. This data erase function unit sequentially performs automatic erasure of data on a hard disk in units of sectors (SC) by turning on a jumper switch, but skips the automatic erasure for any error sector including error among the sectors (SC). For this purpose, it is provided with both an erase unit for full erasure of data and a skip control unit for a partial non-erasure of data.

Abstract: A line printer which comprises a standard type-belt (1) having a plurality of character sets (2), clock (CL) marks for individual characters, and home position (HP) marks for each character set. Further, the line printer comprises a belt image memory (13') for storing the character codes of the characters of the type-belt (1). Flag bits are inserted at positions of the belt image memory (13') corresponding to the reference marks of the character sets (2). Further, the output (HP-D) of the belt image memory (13') is compared with the output (HP) of the type-belt (1) to perform a belt synchronous check.