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. 28, 2009
Filed:
Feb. 13, 2007
Noriaki Satoh, Kanagawa, JP;
Masaharu Kawamura, Kanagawa, JP;
Noboru Yoshida, Tokyo, JP;
Kazunari Tsuchimoto, Kanagawa, JP;
Toyomi Ohsawa, Kanagawa, JP;
Noriaki Satoh, Kanagawa, JP;
Masaharu Kawamura, Kanagawa, JP;
Noboru Yoshida, Tokyo, JP;
Kazunari Tsuchimoto, Kanagawa, JP;
Toyomi Ohsawa, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands, Amsterdam, NL;
Abstract
Embodiments in accordance with the present invention relate to improving error recovery process performance. A head slider in an embodiment of this invention includes a heater for adjusting a clearance between a head element section and a magnetic disk. During an error recovery process (ERP) for a reading error, if a particular environmental temperature is in a low-temperature region, a microprocessing unit (MPU) executes the ERP steps of increasing a heater power value of the heater (i.e., STEP X to STEP X+2), preferentially over the ERP steps of reducing the heater power (i.e., STEP X+3 to STEP X+5). In the low-temperature region, the possibility of error recovery in an earlier step can be raised by executing the heater power increasing ERP steps earlier than the heater power reducing ERP steps.