Title:
【発明の名称】デイスク装置およびデイスク装置におけるヘッド位置制御方法
Document Type and Number:
Japanese Patent JP2980545
Kind Code:
B2
Abstract:
The present invention determines whether a filter is used for reading and writing on a disk to correct repeatable runout. The invention estimates the magnitude of repeatable runout for each disk by measuring the maximum absolute value of a state variable of a filter when the disk is turned on or when the disk returns from a sleep mode, and compares the measured value to a predetermined criterion such as the track width. If the magnitude of the repeatable runout is less than or equal to the predetermined criterion, the filter is not used. If the magnitude of the repeatable runout exceeds the predetermined criterion, the invention reads and writes data using the filter.
Inventors:
YONEDA ISAO
KISAKA MASASHI
YOKOE JUJI
KITAZAKI NOBUYUKI
NAKAMURA TAKASHI
KISAKA MASASHI
YOKOE JUJI
KITAZAKI NOBUYUKI
NAKAMURA TAKASHI
Application Number:
JP24626395A
Publication Date:
November 22, 1999
Filing Date:
September 25, 1995
Export Citation:
Assignee:
INTAANASHONARU BIJINESU MASHIINZU CORP
International Classes:
G11B5/596; G11B21/10; (IPC1-7): G11B21/10
Domestic Patent References:
| JP696538A | ||||
| JP6176514A | ||||
| JP2108286A |
Attorney, Agent or Firm:
Hiroshi Sakaguchi (1 person outside)