SPIRAL WRITE LAUNCH WHILE SERVOING ON REFERENCE GUIDE SPIRALS

摘要

A reference spiral is written on a recording surface of a hard disk drive. By launching writing of fine guide spirals from a launch point that is disposed on a pre-existing coarse guide spiral, writing of the fine guide spiral can be launched in response to a write head crossing the pre-existing coarse guide spiral, rather than in response to a precisely timed event. To enable launch points being disposed on pre-existing coarse guide spirals, launch points are not all located at the same radial position on the recording surface.

主权项

1. A method of writing fine reference spirals on a recording surface of a magnetic storage device based on locations of coarse reference spirals previously written on a recording surface of the magnetic storage device, said method comprising:
controlling the write head to move to a first write start position on a recording surface of the magnetic storage device and write a first fine reference spiral therefrom; and controlling the write head to move to a second write start position on the recording surface on which the first fine reference spiral is written and write a second fine reference spiral therefrom, wherein the first and second write start positions are at different radial locations.