JPS6428581U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an empty track search circuit according to the present invention, Fig. 2 is a diagram showing the signal recording area of a magnetic disk and an index track, and Fig. 3 is a diagram showing the signal recording state of the index track and changes in the reproduced signal. FIGS. 4 and 5 are flowcharts showing circuit operations. 2... Signal recording area, 3... Index track, X... Index playback signal, Y... Dropout detection signal.

Claims (1)

[Scope of utility model registration request] It is equipped with a head transfer device that moves the signal recording and reproducing head 6 in the radial direction of the disk that rotates at high speed, and a signal recording system 7 is connected to the head 6 to record concentric signals in the signal recording area 2 on the signal surface of the disk. In a disk recording device forming a track, a drive control circuit 24 capable of controlling the head transfer device to set the head 6 on the index track 3 provided outside the signal recording area 2; an index recording circuit that writes recorded/unrecorded discrimination information for each signal track in the signal recording area 2 to the index track 3; an index playback circuit that reads and outputs the recorded/unrecorded discrimination information from the index track 3; It is composed of a system control circuit 11 that controls the operations of the drive control circuit 24, the index recording circuit, and the index reproducing circuit. An empty track of a disk recording device, characterized in that a first control section instructs playback, and a second control section instructs update recording of an index track 3 after completion of recording in a signal recording area 2. search circuit.