Determining a skew error signal (SES) offset used to determine an SES to adjust heads in a drive unit

摘要

Provided are a computer program product, system, and method for determining a skew error signal (SES) offset used to determine an SES to adjust heads in a drive unit. A determination is made of a first difference in a first orientation with respect to a direction of movement of the recordable storage media based on first and second position information read by first and second servo read elements on a first head. A determination is made of a second difference in a second orientation with respect to the direction of movement of the recordable storage media based on third and fourth position information read by the first servo read element and a third servo read element on a second head. An offset, calculated based on the determined first and second difference, is used to generate an error signal to adjust the first and second heads.

主权项

1. A computer program product for controlling heads in a drive to access data on a recordable storage media, the computer program product comprising a computer readable storage medium having computer readable program code embodied therein that executes to perform operations, the operations comprising:
reading, by a first servo read element and second servo read element on a first head, first and second position information from a servo pattern on a recordable storage media; determining a first difference in a first orientation with respect to a direction of movement of the recordable storage media based on the read first and second position information; reading, by the first servo read element and a third servo read element on a second head, third and fourth position information from the servo pattern; determining a second difference in a second orientation with respect to the direction of movement of the recordable storage media based on the read third and fourth position information; calculating an offset based on the determined first and second differences; and using the calculated offset to generate an error signal to adjust the first and second heads during read and write operations with respect to the recordable storage media.