The Understanding File Compression Formats module provides you with the instruction and devices to develop your hands on skills in the defined topics. This module includes the following exercises:

  • Working with different file compression formats
  • Creating ISO images
  • Working with DMG Images
  • Working with JAR files

Exercise 1 - Working with File Compression Formats

File compression is a technique of reducing the number of bits of data in a file without the loss of necessary information. Compressing files enables you to store them with lower disk space requirements; thereby making the long-term storage of the files more economical.

Note that compression in case of data transmission is normally referred to as source coding - coding the signal at the point of origin.

Compression techniques can be either lossless or lossy. In a lossless compression, the statistical redundancy bits are identified and eliminated. Therefore, all the information is preserved. In lossy compression, the “unnecessary information” bits are identified and eliminated; resulting into some loss of information.

In this exercise, you will install 7-Zip and WinRARfile compression utility and compress files using these formats In addition, you will compress files using some of the formats supported by these formats.

Exercise 2 - Creating ISO Images

An ISO image is an archive file of a CD or a DVD media. An ISO image contains data from every written sector on a CD or DVD disc. It also retains the file system followed on the optical media. In fact, the name ISO comes from the name of the ISO 9660 file system implemented on optical media. These archive files are identified by a file extension of .iso. Sometimes the ISO files might contain UDF files as well, where UDF is another commonly used file system for optical media.

You can create an ISO file image by using file imaging techniques on an optical disc; or even without an existing optical disk by using third party ISO creator applications. In this exercise, you install UltraISO to create ISO images.

Exercise 3 - Working with DMG Images

Disk image files on Mac OS are referred to as Apple Disk Images and are identified by the .dmg file extension. These disk images are most useful while distributing software over the Internet. To manage apple disk image files on Windows, you can use TransMac, a third party file management shareware.

In this exercise, you will install TransMac that can be used to read the contents of a .dmg file.

Please refer to your courseware or use your preferred search engine to get more information about this topic.

Exercise 4 - Working with .JAR files

The Java Archive (JAR) file format allows you consolidate related class libraries into one archive file. Typically a JAR file contains the class files and auxiliary resources associated with applets (mini-applications) and applications.

In this exercise, you will create a basic JAR file by combining some existing files from the Windows file system.

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