Abstract:
A system and methods for efficiently performing media writing functions is disclosed. The system and methods include: detecting media movement with respect to a base and heads during reading and writing, and moving the heads in response; using an interferometer, such as a dual beam differential interferometer, to dynamically monitor disk position and address perceived errors; and minimizing repeatable and non repeatable runout error by writing data, such as servo bursts, in multiple revolutions to average adverse runout conditions. The present system has the ability to use an interferometer to enhance media certification and perform on line, in situ monitoring of the media, and includes shrouding, head mounting, disk biasing, and related mechanical aspects beneficial to media writing.
Abstract:
A system and methods for efficiently performing media writing functions is disclosed. The system and methods include: detecting media movement with respect to a base and heads during reading and writing, and moving the heads in response; using an interferometer, such as a dual beam differential interferometer, to dynamically monitor disk position and address perceived errors; and minimizing repeatable and non repeatable runout error by writing data, such as servo bursts, in multiple revolutions to average adverse runout conditions. The present system has the ability to use an interferometer to enhance media certification and perform on line, in situ monitoring of the media, and includes shrouding, head mounting, disk biasing, and related mechanical aspects beneficial to media writing.
Abstract:
A system (110) and method for performing a combined media certification and servo data writing function is disclosed. The system and method include mounting a plurality of media, such as hard disks (121), to a spindle (120) and using at least one positioner (117) to move multiple read write heads (113) over disk surfaces according to multiple specific aspects of the invention. One aspect of the invention comprises performing certification on a first pass, writing servo pattern data on a second pass, and verifying servo data on a third pass over the media. The system may require high performance read/write heads, writing of coherent patterns in addition to servo patterns, use of multiple positioners, and additional hardware to perform the joint certification and servowriting function.