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Operating_systems-page46 - Jelena Mamenko Operating Systems...

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Jelena Mamčenko Operating Systems Lecture Notes on Operating Systems 46 Fig. 4. Sector The number of sectors per track varies with the radius of the track on the platter. The outermost tracks is larger and can hold more sectors than the inner ones. These outer tracks also spin faster under the head than do the inner ones, because while the angular speed remains the same, the larger circumference results in more sectors spinning by in the same period for the outer tracks. Disk blocks are numbered starting at the outermost track, so put the data you expect to access most often on partition, or slice, 0. 27.3 Cylinder group SunOS uses the Berkeley fast file system which uses cylinder groups . A group is formed form 32 or fewer cylinders on a disk (default 16). Each cylinder group has a redundant copy of the
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