The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2004
Filed:
May. 30, 2001
Jeffrey H. Lake, Bloomington, MN (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
A system for measuring fly height of a head over a rotatable magnetic disc having a disc surface on which data is digitally stored is provided. Data is digitally stored on the disc surface by selectively polarizing portions of the disc surface into at least a first magnetic state or a second magnetic state. A read back circuit is coupled to the head. The read back circuit generates an electrical read back signal in response to the head encountering a transition between magnetic states. The system for measuring fly height includes a measurement circuit coupled to the head read back circuit to measure pulse width and amplitude of the read back signal. A calculation circuit coupled to the measurement circuit determines the fly height of the head based on the measured pulse width and amplitude of the read back signal. In addition, a method of measuring the fly height of a head by using a read back signal in a disc drive storage system is provided.