Magnetic recording disk drive with position error signal (PES) blocks in the data tracks for compensation of track misregistration

摘要

A magnetic recording hard disk drive (HDD) includes, in addition to conventional servo sectors with position error signal (PES) blocks, data position error signal (DPES) blocks that are written into the data sectors when data is written in the data sectors of the data tracks. During readback the PES blocks from the servo sectors are decoded into PES values to allow the head to follow the servo track, while the DPES blocks are decoded to obtain DPES values that are used in the servo control loop to modify the head position so the head follows the center of the data track. In a shingled magnetic recording HDD, wherein the write head is at least two shingled data tracks wide, a DPES block is written in two radially adjacent data tracks when data is written into the data sectors of the shingled data tracks.

主权项

1. A shingled magnetic recording disk comprising:
a plurality of radially spaced shingled data tracks arranged into a plurality of annular bands separated by inter-band gaps, 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; and a plurality of angularly adjacent first and second data position error signal (DPES) blocks within the data sectors and extending radially across the data tracks in a band, each DPES block having a radial width of at least two data tracks, the first and second DPES blocks alternating in the radial direction and the DPES blocks in one angular position being shifted radially from the DPES blocks in the angularly adjacent position by one data track.