Abstract: A magnetic recording playback system compatible with both a 8 mm video format and a rotary head digital audio tape form. A rotary head records tilted track on the tape. The track is divided into four areas which recorded with different tapes of audio signals. The signals may also be divided between adjacent tracks. Each area has its own control information. Different sampling rates are used for the two different formats.

Abstract: A magnetic recording playback system compatible with both an 8 mm video format and a rotary head digital audio tape form. A rotary head records tilted tracks on the tape. Each track is divided into four areas which are recorded with different types of audio signals. The signals may also be divided between adjacent tracks. Each area has its own control information. Different sampling rates are used for the two different formats.

Abstract: A tape position data recording and reproduction method whereby the start points of all programs recorded on the tape can readily be determined merely by playing the tape for a very short time in the reproduction mode. Position data related to a present program and position data related to all subsequent programs are repeatedly recorded at predetermined positions in digital data recording tracks, which are provided as extensions of the tracks containing the video signal. Once the numerical value indicative of the start position of the desired program has been determined, the tape can readily be advanced to that point.

Abstract: An optical information recording disc having pits in a first film formed on one of major surfaces of the disc is uniformly covered with a suitable second film, whereby the size of each pits is corrected. When the disc is to be used as a mother disc for production of replicas, at least the wall of each pit is covered by a third layer having continuously increased thickness towards the bottom of the pit so that a peeling off of an intermediate transfer disc from the mother disc is facilitated.