Writable servo overlap zones

A device comprising:

• a disc data storage medium including:
• N servo super zones including a first servo super zone and the second servo super zone, N being a positive integer greater than or equal to two, the servo super zones including a plurality of tracks and having servo patterns;
• a controller configured to:
• determine a first servo gate (sgate) timing for a first overlap zone including servo patterns of the first servo super zone and servo patterns of the second servo super zone, the first sgate timing based on servo pattern timing for the first servo super zone and the second servo super zone;
• and
• initiate writing user data to the first overlap zone based on the first sgate timing.

A device comprising:

• a disc data storage medium including a first servo super zone and a second servo super zone, the servo super zones including a plurality of tracks and having servo patterns;
• a controller configured to:
• control movement of a transducer head over the disc data storage medium, including:
• determining when the transducer head will cross from the first servo super zone to the second servo super zone;
• calculating a trajectory error prior to the crossing, the trajectory error due to a change in servo pattern frequency between the first servo super zone and the second servo super zone;
• and
• providing 1/X of the trajectory error into a servo feedback loop for a following X servo sampling points, X being a positive integer.