Patent ID: 8027117
Filing Date: 2011-09-27
Classification: G11B

Abstract:
1. A hard disk controller (HDC) of a hard disk drive (HDD), comprising: a read module that reads servo spirals from a magnetic medium of the HDD via a read head of the HDD and that generates read signals; a clock generator module that generates a spiral clock having a first frequency based on the read signals and that generates based on the spiral clock R write clocks having R frequencies, respectively, that are different than the first frequency, where R is an integer greater than 1; and a write module that writes a first servo wedge via a write head of the HDD on a first one of R zones of the magnetic medium using a first one of the R write clocks and that writes a second servo wedge via the write head on a second one of the R zones using a second one of the R write clocks.