Rotatable head type digital magnetic recording and reproducing device having a plurality of operating modes

A rotatable head type digital magnetic recording and reproducing device for recording and reproducing signals, comprising;

• a rotary drum;
• a first recording and reproducing head having an azimuth angle provided on said rotary drum;
• a second recording and reproducing head having an azimuth angle different from that of said first head and provided at a position opposite to said first head on said rotary drum in terms of a circumferential direction thereof;
• a third recording and reproducing head, adjacent to said second head, having an azimuth angle different from that of said second head;
• selecting means, operatively connected to said first and third heads, for selecting an operation mode from a plurality of operation modes, said plurality of operation modes including at least a normal recording and reproducing mode using said first and second heads and a long time recording and reproducing mode using said third head and second head, said operation modes being performed at a same rotational speed of said rotary drum, but being performed at different tape speeds;
• and
• a sole equalizer to equalize all the signals produced by said operation modes.