Disk drive device and clearence control method thereof

To more precisely control the clearance between a head and disk for the pressure without using a barometric sensor. In an embodiment of the present invention, an HDD determines a clearance from variations in operational parameters, and further determines a variation in pressure by deducting the clea...

Full description

Saved in:
Bibliographic Details
Main Authors TAKEICHI, ATSUSHI, AKAGI, KYO, KOUNO, TAKASHI, IWAISAKO, TOSHIHIKO, ISHIWATA, KENSUKE, KUROKI, KENJI
Format Patent
LanguageEnglish
French
German
Published 03.06.2009
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
Online AccessGet full text

Cover

More Information
Summary:To more precisely control the clearance between a head and disk for the pressure without using a barometric sensor. In an embodiment of the present invention, an HDD determines a clearance from variations in operational parameters, and further determines a variation in pressure by deducting the clearance variation caused by a variation in temperature from the clearance. When the HDD controls the clearance in accordance with the pressure change, the HDD checks for head-disk contact. The accuracy and reliability in pressure measurement (clearance measurement) using operational parameters are not high. Therefore, confirming the pressure 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 the clearance.
Bibliography:Application Number: EP20080018003