Operating system concepts 8th edition pdf silberschatz

This article is about the way computers organise data stored on media such operating system concepts 8th edition pdf silberschatz disk. By separating the data into pieces and giving each piece a name, the information is easily isolated and identified.

The structure and logic rules used to manage the groups of information and their names is called a “file system”. There are many different kinds of file systems. Each one has different structure and logic, properties of speed, flexibility, security, size and more. Some file systems have been designed to be used for specific applications. By 1961 the term was being applied to computerized filing alongside the original meaning. By 1964 it was in general use. A file system consists of two or three layers.

Sometimes the layers are explicitly separated, and sometimes the functions are combined. The logical file system “manage open file table entries and per-process file descriptors. This interface allows support for multiple concurrent instances of physical file systems, each of which is called a file system implementation. Note: this only applies to file systems used in storage devices. File systems allocate space in a granular manner, usually multiple physical units on the device. For a 512-byte allocation, the average unused space is 256 bytes. For 64 KB clusters, the average unused space is 32 KB.

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