hesela.devSector slipping
Sector slipping assigns successive logical blocks to successive usable physical sectors while omitting defective positions from the address sequence.
The 1997 drive manual lists slipping at format time separately from automatic reallocation and post-format reassignment. [1]
The Hoskins patent describes full-volume slipping and separate alternate-sector redirection for later defects. Its slip list translates logical addresses past excluded positions; it is a documented design, not evidence that every HDD uses that algorithm. [2]
Relations
Limitations
- Slipping is not restricted by definition to one track; the cited patent describes a full-volume design. [2]
- Formatted capacity depends on reserved spares and sector size in the documented 1997 drive configuration. [1]
- A remapping count alone does not determine access latency; the 1994 model needed layout and rotational-position information and omitted individual spared-sector effects. [3]
Citations
- Seagate Barracuda 9 Product Manual, 83329030 Rev. C (July 1997), sections 3.1 and 3.5, pp. 6-7
- Edward Sean Hoskins, Full volume slip defect management in a disc drive, US 6,925,580 B2 (2005), description of Figures 7-17
- Ruemmler and Wilkes, An introduction to disk drive modeling (1994), Data layout and Conclusions, author PDF pp. 5 and 15
Sources & caveats
- Historical source synthesis; no drive measurement or claim of current firmware coverage. IBM 3340 within-record defect skipping is a different mechanism.