The invention includes a method for longitudinal position (LPOS) detection in a
magnetic tape storage
system for storing data upon linear tape open (LTO)
magnetic storage tape, which data includes odd and even 36-bit LPOS words with
error correcting ability. The method includes steps of encoding positional information onto the
magnetic storage tape within the odd and even 36-bit LPOS words using each LPOS word's 8-bit
sync mark field, Sy, and six of each LPOS word's 4-bit symbol fields, L0, L1, L2 L3, L4, and L5, wherein 6 of 24 total bits comprising the encoded 8-bit
sync mark field: Sy, and six 4-bit symbol fields: L0, L1, L2 L3, L4, and L5 are utilized as parity bits, operating the
magnetic tape storage
system by passing the LTO
magnetic storage tape encoded with the odd and even LPOS words with
error correcting ability longitudinally across a
servo reader / writer at a known speed, decoding the encoded positional information by reading either two words sequentially or two words simultaneously, the simultaneous reading requiring that the LPOS words include
servo band numbers and detecting and correcting both ambiguous bits and single erroneous bit errors.