Files Compressing & Extraction

One of the ways that a user can save storage space is to compress the data files that are stored on the hard disk drive. In order to do this, you need a Compression program to perform this task.

Data compression reduced wastage in the storage system. It squeezes the information into the smallest available space possible and through a decompression process, the information can be re-constructed back into its original form.

The compression ratio compares the resultant storage requirements to those required by the uncompressed data. Most data-compression systems achieve about a 50-percent compression ratio on the mix of data that most people use.

Compression has proved to be such a valuable technology that it is used in other ways besides increasing disk storage. For example, advanced modem protocols often include data compression to increase throughput levels. In addition, file-archiving software such as WinZip can also takes advantage of compression to maximize your hard disk’s space.

File-compression and file-archiving software differs from ordinary disk compression in several ways. It works on a file-by-file basis rather than the whole hard disk. It is not automatic; you manually select the files you want to archive and compress. It compresses files individually but combined several files together into a single archive file.

Archive files are stored as ordinary Windows files and at times can also be read or executed even before extraction. Using compressed files for faster transfering of data between media is possible due to lesser files involved. It also minimize the Internet bandwidth usage during transfer over the web.

Example of files ( 171KB ) before running WinZip software :

Example of same files but now being compressed into a .ZIP file ( 30kb ) :

As you can see, the files were compressed and the total file size reduction is very huge.

The common archiving software available in the market are :

1. WinZip — The Compression Utility For Windows

2. WinRAR — WinRAR supports all popular compression formats (RAR, ZIP, CAB, ARJ, LZH, ACE, TAR, GZip, UUE, ISO and BZIP2).

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