Patent ID: 7423827
Filing Date: 2008-09-09
Classification: G11B

Abstract:
1. A method for accessing data using a variable polarity head assembly, the method comprising: receiving a data set; sampling the data set to create a first sample set, wherein the first sample set is formed using a positive synchronization, and wherein the positive synchronization is achieved by a first phase lock loop synchronizing to the maximum peaks of a portion of the data set; identifying a portion of the first sample set corresponding to a first sync mark; sampling the data set to create a second sample set, wherein the second sample set is formed using a negative synchronization, and wherein the negative synchronization is achieved by a second phase lock loop synchronizing to the maximum peaks of an inverted portion of the data set; identifying a portion of the second sample set corresponding to a second sync mark; comparing the first sync mark with the second sync mark; based at least in part on the comparison of the first sync mark and the second sync mark, determining a polarity of the data set.