Magnetic Disk Device Shingled Write Band Offset Rewriting

The disk surface is divided into multiple bands in the radial direction, with each band containing multiple tracks that can be independently managed. This segmentation allows the system to perform refresh operations on only the necessary bands rather than entire regions, reducing overall refresh time and improving write/read responsiveness while maintaining high recording density through shingled write magnetic recording.

Instead of refreshing or overwriting entire regions as in conventional magnetic recording, the patent performs partial actions by targeting specific bands or track groups within bands. This partial action approach reduces the scope of rewrite operations, thereby decreasing refresh and overwrite times while preserving the high recording density capability of shingled write magnetic recording.

By segmenting the disk into bands and further dividing bands into track groups, the patent creates a hierarchical data management structure. This segmentation enables more granular control over rewrite operations, allowing the system to manage data in smaller, more efficient units rather than entire bands, thus reducing rewrite time while maintaining ease of operation through structured management.

The patent introduces a new dimensional organization by grouping tracks within bands into track groups that can be independently managed. This additional organizational dimension allows for more flexible and efficient rewrite operations, reducing the time required while maintaining simplified data management through the structured hierarchical approach.