Chu Alfredo Sam,Zhu Wenzhong,Chow Siew Kin,Martens Franklin P.
申请号：
US201615294946
公开号：
US9734862(B1)
申请日:
2016.10.17
申请国别(地区):
美国
年份:
2017
代理人:
Hollingsworth Davis, LLC
摘要：
A first tone is written at a first frequency to outer tracks that surround an inner track of a magnetic recording medium. A second tone is written at a second frequency different from the first frequency to the inner track. The first and second frequencies are both lower than a frequency of an AC erase signal. A crosstrack profile of the inner track is determined based on reading amplitude of the second frequency via the read/write head.
