Tape heads and controllers for controlling such heads in a tape drive are
described. A controller may determine a first parameter corresponding to
the similarity between data read by a first pair of read elements of a
head, a second parameter corresponding to the similarity between data
read by another pair of read elements having one read element in common
with the first pair, and a position of the head with respect to a data
track based upon a relationship between the first and second parameters.
The controller may adjust the head to a proper lateral position based
upon the determined position.