Compression of files with utilities

Compression ratio with compression utilities is usually better than “on the fly” compression at the file system level.

Compression utilities look for repeated text and try to reduce the size by replacing this text.

Compression utility RAR has a feature known as “solid” archive. If making a solid archive feature chosen, then repeatable text will be searched in all of the files and not in file by file basis.

Making a solid archive is usually more time consuming operation.

An opposite of compression is decompression operation, restoring original data from a compressed file.

Why compression can be used? It can be used to distribute files. It is easier to distribute one file verses distributing multiple files.

Another reason to compress files is to save disk space. Even so disk space is hardly an issue these days.

Distributing a single file is easier than distributing multiple files.  

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