Information recording and reproducing device

Abstract

Abstract PURPOSE:To eliminate a useless seek operation and to enable an optical head to seek a target in its nearer position by correcting an error due to rotation of a recording medium during a moving time of the optical head. CONSTITUTION:First, a comparison is made between a target track address to be sought and a track address where the optical head 3 is presently positioned. As a result of this comparison, if they are not equal to each other, their difference is calculated from absolute values of the target track address and the present positioning track address as a 1st relative value T1. Secondly, in order to obtain an error during th moving time of the optical head 3, a calculation is made to evaluate a 2nd relative value T2. Then, a position of a target sector address and an arrival position after seeking are compared with each other, and if the target position is below the arrival position after seeking, a parameter P is decided as -1. On the contrary, if the target position is larger than the arrival position after seeking, the parameter P is set as 0. Then, such obtained T1, T2 and P are added up to find and execution relative number T, and based on an obtained result, the seek operation is executed.

Inventors

• 👤 Yoshitaka Ogino
• 👤 荻野　良孝

Bibliographic Details