Patent ID: 8477445
Filing Date: 2013-07-02
Classification: G11B

Abstract:
1. A write clock synchronization apparatus for magnetic recording disk drives with patterned media comprising: A. an analog to digital converter (ADC) for receiving an analog read back signal from a magnetic read head, and converting the analog read back signal into a digital read back signal; B. a preamble processor having a read back signal input coupled to receive the digital read back signal, a digital clock input, an address mark output, a phase deviation output, and a sector length output, wherein said preamble processor is operative to: C. a next sector length predictor having a sector length input, an address mark input, an index input, and a predicted sector length output, wherein said sector length predictor is operative for a current detected preamble, to: D. a phase increment calculator responsive to the address mark and the phase deviation from the preamble processor and next predicted sector length from the next sector length predictor, and operative to generate a phase increment value at a calculator output; and E. a clock generator responsive to the phase increment value from the phase increment calculator output, and operative to: