Tape storage system having error correction function of longitudinal position data, a method for encoding the error correction function, and the program

摘要

The present invention provides a method of encoding has the error correction function of the LPOS word representing the longitudinal position of the magnetic tape relative to the tape head of tape storage system. A longitudinal position (LPOS) word L (n) is encoded with a error correction function. LPOS word, [1] In is calculated, and includes a plurality of LPOS symbols L0 representing the longitudinal position of the magnetic tape (n) ~Lk (n) to the tape head in the tape storage system. Word type is determined in response to at least one of the plurality of LPOS symbols, in response to the determined word type, has at least one format symbol F (n), a plurality of LPOS symbols It is generated from the L (n). At least one parity symbol P (n) is generated from the formatted symbol F (n). Formatted symbols and parity symbols, is transmitted to the servo channel of the tape storage system to be recorded in the servo track of the magnetic tape. By adding redundancy to the LPOS word, and provides a function of correcting multiple bit errors without increasing the LPOS word length. .BACKGROUND