Device for controlling recording track jump operations with over-run correction

A device for causing a data detecting spot to move a preset number of tracks on a data recording disc having a plurality of tracks from an initial track at which said data detecting spot is initially positioned to an aimed track, said device comprising:

• moving means for selectively causing said data detecting spot to move in a forward or reverse direction in response to positioning signals;
• a counter for storing a track value representing the number of recording tracks between a current track at which said data detecting spot is directed and said aimed track;
• means for initially setting said counter to said preset number of tracks;
• means, coupled to said counter and to said moving means, for generating said positioning signals to cause said moving means to move said data detecting spot in a forward direction toward said aimed track by a distance corresponding to the track value stored in said counter;
• means for generating a track signal each time said data detecting spot traverses one of said plurality of tracks;
• means for decrementing said counter is response to said track signal;
• detecting means, coupled to said track signal generating means and to said counter, for detecting that said data detecting spot has been moved by said moving means in a forward direction to a track beyond said aimed track, said detecting means including means for causing said counter to store a track value corresponding to an over-run number of tracks representing the number of additional tracks on said data recording disc which said data detecting spot traversed after traversing said aimed track;
• and
• means, coupled to said detecting means, for causing said positioning signal generating means to generate positioning signals to cause said moving means to move said data detecting spot in a reverse direction back toward said aimed track by a distance corresponding to said over-run number of tracks.