Disk drive device and clearance control method the

专利名称：Disk drive device and clearance control

method thereof

发明人：Kenichi Kuramoto,Masayuki Kurita,Yoshihiko

Maeda,Hidetsugu Tanaka,AkihiroSera,Katsumasa Yamazaki

申请号：US12290533申请日：20081030

公开号：US20090141391A1公开日：20090604

专利附图：

摘要：Embodiments of the present invention help to precisely control the clearance

between a head and disk for the pressure without using a barometric sensor. In anembodiment of the present invention, an HDD determines a clearance from variations inoperational parameters, and further determines a variation in pressure by deducting theclearance variation caused by a variation in temperature from the clearance. When theHDD controls the clearance in accordance with the pressure change, the HDD checks forhead-disk contact. The accuracy and reliability in pressure measurement (clearancemeasurement) using operational parameters are not high. Therefore, confirming thepressure measurement by the presence or absence of head-disk contact eliminates head-disk contact in the following read/write operation to attain a securer margin for theclearance.

申请人：Kenichi Kuramoto,Masayuki Kurita,Yoshihiko Maeda,Hidetsugu Tanaka,AkihiroSera,Katsumasa Yamazaki

地址：Kanagawa JP,Kanagawa JP,Kanagawa JP,Kanagawa JP,Kanagawa JP,Kanagawa JP

国籍：JP,JP,JP,JP,JP,JP

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