Patent ID: 9299375
Filing Date: 2016-03-29
CPC Classification: G11B

Claim Text:
1. A method for compensating for tape dimensional changes, the tape being wound within a tape cartridge, the method comprising: in response to determining that a first write operation is to be performed on a portion of tape; setting a spacing between tape head elements, with respect to the direction of travel of the tape over the two tape head elements, to a nominal value by one or more of setting a tape head azimuth angle, and setting the physical spacing of tape head elements relative to one another, wherein the nominal value is based on a specification or standard associated with a tape technology, and on a function of tape position that compensates for the widening of the tape at inner diameters of the tape cartridge; writing data to tape blocks of a data track; determining tape widths at tape positions of one or more of the tape blocks to which the data is written, based on a width of servo tracks at the tape positions and the tape head element spacing nominal value, wherein the positions of the one or more of the tape blocks to which the data is written are based on one or more of a predetermined tape distance interval, or the beginning of each tape block; and recording in a data store associated with the tape the determined tape widths and the tape head element spacing nominal value; in response to determining that a requested tape operation to a tape is not the first write operation; retrieving the recorded the determined tape widths and the tape head element spacing nominal value; setting the tape head element spacing, with respect to the direction of travel of the tape over the tape head elements, to the retrieved tape head element spacing nominal value as the function of tape position by one or more of setting the tape head azimuth angle, and setting the physical spacing of tape head elements relative to one another; determining a current tape width value associated with the tape; and adjusting the tape head element spacing as the function of tape position, with respect to the direction of travel of the tape over the tape head elements, by one or more of setting the tape head azimuth angle, and setting the physical spacing of tape head elements relative to one another, based on a difference between the retrieved one or more recorded tape widths and the determined current tape width value.