Sectors
The disk interface typically represents the disk as a linear array of blocks
Disk maps logical locations to physical sectors
Disk maps logical locations to physical locations
Zoning
- Puts more sectors on larger tracks
- Outside tracks with larger radius
Track skewing
- Outside tracks with larger radius
- Sector 0 position varies by track to improve sequential access time
Sparing - Flawed sectors are remapped to locations
OS doesn’t know logical to physical mapping
- Larger logical number difference means larger seek times
- Non-linear
- Depends on zone