Magnetic recording disk drive with write position error signal values written in the data tracks for compensation of track misregistration

A two-dimensional magnetic recording (TDMR) disk drive comprising;

• a magnetic recording disk comprising
• a plurality of radially spaced data tracks, the data tracks including data sectors;
• a plurality of radially spaced servo tracks having a plurality of angularly spaced servo sectors extending across the servo tracks and data tracks, the servo sectors containing position error signal (PES) blocks;
• two read heads for reading data from the data tracks, at least one of the read heads adapted to read PES blocks from the servo tracks;
• a write head for writing to the data sectors;
• a head carrier supporting the read heads and write head;
• an actuator connected to the carrier for moving the read heads and write head radially across the disk;
• read/write electronics coupled to the read heads and write head for causing data to be written into the data sectors of a data track by the write head and for decoding the PES blocks read by said at least one read head from a first servo track into PES values while the write head is writing data in the data sectors of said data track, the read/write electronics adapted to cause the write head to write said PES values (WPES values) into the data sectors when writing data into the data sectors of said data track;
• an encoder for encoding the PES values into encoded WPES values prior to causing the WPES values to be written into the data sectors of said data track;
• a decoder for decoding the encoded WPES values read by the read heads from the data sectors of said data track;
• and
• servo electronics coupled to the actuator for moving said at least one read head to a second servo track prior to reading data sectors from said data track, the servo electronics adapted to adjust the radial position of said at least one read head relative to said second servo track when reading said data track in response to the difference between the decoded WPES values from the data sectors in said data track and the PES values decoded from the PES blocks in said second servo track.