Updating a file random access

Updating a file random access

For example, the ISO 9660 file system is designed specifically for optical discs.

As files are deleted the space they were allocated eventually is considered available for use by other files.This creates alternating used and unused areas of various sizes. When a file is created and there is not an area of contiguous space available for its initial allocation the space must be assigned in fragments.When a file is modified such that it becomes larger it may exceed the space initially allocated to it, another allocation must be assigned elsewhere and the file becomes fragmented.For 64 KB clusters, the average unused space is 32 KB.The size of the allocation unit is chosen when the file system is created.

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In some file systems, filenames are not case sensitive (i.e., filenames such as refer to three separate files).

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