Data recording/reproducing apparatus of spiral trade system with kick back control

摘要

In an apparatus for recording/reproducing data on a disc along a spiral track, a track-turn position of a record/reproduce head is changed in response to a kick back signal determined by a value of the register and read/write error signal just after a sector pulse or an address signal in addition to the conventional access command which changes the track-turn position through calculation from address included in the access command and the present address. The change of the track- turn position by the kick back signal makes access time shorter than that which would be done by the conventional access command. Moreover, in such apparatus, execution of the kick back operation is determined at every N sectors, wherein N=M-[T1/T2], where M is the number of sectors of one track turn; T1 is a time interval necessary for changing the record/reproduce head by one track-turn back; T2 is an interval necessary for scanning one sector by the record/reproduce head; and [T1/T2] shows a least natural number more than T1/T2. This makes timing of start for reading/writing earlier after the kick back operation.