Abstract: In general, techniques are described for compressing an indirection table. A device comprising a processor and a memory may be configured to perform the techniques. The processor may be configured to form a plurality of physical containers, each of the plurality of physical containers representative of a plurality of physical block addresses, wherein each of the plurality of physical containers corresponds to one or more logical block address. The memory may be configured to store an indirection table that maps the logical block addresses to the plurality of physical containers. The processor may be further configured to perform run-length encoding of the plurality of physical containers to compress the indirection table.

Abstract: In general, techniques are described for compressing an indirection table. A device comprising a processor and a memory may be configured to perform the techniques. The processor may be configured to form a plurality of physical containers, each of the plurality of physical containers representative of a plurality of physical block addresses, wherein each of the plurality of physical containers corresponds to one or more logical block address. The memory may be configured to store an indirection table that maps the logical block addresses to the plurality of physical containers. The processor may be further configured to perform run-length encoding of the plurality of physical containers to compress the indirection table.

Abstract: A magnetic storage system includes a magnetic storage medium, a random-access memory (RAM), and a controller. The controller interfaces with both the magnetic storage medium and the RAM, and implements a refresh algorithm that determines when a data track on the magnetic storage medium should be refreshed. The controller maintains in the magnetic storage medium a plurality of finer-granularity damage count tables, each table having finer-granularity damage counts each representing damage to one or more sectors within each of the plurality of tracks associated with the table. The controller maintains in RAM a plurality of track-level damage count values, each associated with one of the plurality of data tracks and representing estimated damage to one of the plurality of data tracks. Based on data written to the plurality of data tracks, the controller utilizes finer-granularity damage count tables stored in the magnetic media to update the track-level damage.