Magnetic disk drive having a function for using a

专利名称：Magnetic disk drive having a function for

using a thermal protrusion amount for flyingheight management and an inspectiondevice having such a function

发明人：Akira Morinaga,Yoji Maruyama,Hiroshi

Ide,Norifumi Miyamoto

申请号：US10890073申请日：20040712公开号：US07330324B2公开日：20080212

专利附图：

摘要：A write head's material having a great thermal expansion coefficient expandsdue to Joule heat resulting from a write current and a temperature rise dependent onhigh-frequency core loss, thereby causing the head's flying surface to protrude toward amagnetic disk. This phenomenon is called TPR (thermal protrusion). It is essential that theflying height be accurately determined and managed in consideration of TPR. A magneticdisk drive for actual use or a magnetic disk drive that is in a testing process but similar tothe one for actual use is used to measure TPR amount changes resulting from a writeoperation, store the resulting measured data in a memory or on the magnetic disk, andperform flying height management with the stored measured data. Further, flying heightmanagement is performed as needed in conjunction with a SMART function. The presentinvention makes it possible to perform high-reliability flying height management.

申请人：Akira Morinaga,Yoji Maruyama,Hiroshi Ide,Norifumi Miyamoto

地址：Kanagawa JP,Saitama JP,Tokyo JP,Kanagawa JP

国籍：JP,JP,JP,JP

代理机构：Townsend and Townsend and Crew LLP

代理人：Rambod Nader

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