Title:
【発明の名称】デイスクドライブにおける熱誘起トラツク外れエラ-の補償方法
Document Type and Number:
Japanese Patent JP2583220
Kind Code:
B2
Abstract:
A thermal test track (- 3) is provided outside the user-accessible area on the disc. A track complete of a known frequency is then written on either side of this thermal test track, preferably half the usual track separate distance away. To develop a thermal compensation constant, the transducer (10) is moved to the thermal test track with no compensation applied. This way, any thermally induced off-track error, which would affect seeks to user-accessible data tracks, will be reflected in the off-track from the nominal position of the thermal test track. The transducer is now moved in a series of defined increments (e.g. 5) smaller than normal track-to-track steps, or "micro-steps", away from the uncompensated position of the thermal track toward one of the tracks written with the known frequency. When the data on the written track to the side of the thermal test track is detected, a note is made of the number of micro-steps the transducer has been moved. The transducer (10) is then micro-stepped incrementally in the opposite direction until the data written on the other side of the thermal test track is detected. A simple comparison of these two micro-step counts will yield the existing thermal shift, which can be converted into a thermal compensation constant for the transducer positioning mechanism by means of a simple look-up table.
Inventors:
JEEMUSU NOOMAN KUROOZU
Application Number:
JP27776586A
Publication Date:
February 19, 1997
Filing Date:
November 20, 1986
Export Citation:
Assignee:
SEAGATE TECHNOLOGY
International Classes:
G11B5/55; G11B21/10; G11B5/596; (IPC1-7): G11B21/10
Domestic Patent References:
| JP537213A | ||||
| JP54119907A | ||||
| JP60136975A | ||||
| JP6087477A |
Attorney, Agent or Firm:
Minoru Nakamura (6 outside)