This article was originally posted on computer-supports.com and we have reposted it here for reference in case anyone still needs it.

This time we try to recognize a file system located in the directory C: \ with a size of about 2 kilobytes. This file is closely related to the Windows boot process because it contains a variety of settings that need to be run by the operating system and what does not need to be run. His name is MSDOS.SYS. MSDOS.SYS file has three important parts. The first part is the path that contains information about the location of the Windows directory, the second part is the options for various settings that need to run Windows; and last part contains rows of letters xxxxxx serving to maintain compatibility with other programs.

This time we will know the options because in addition to the interesting part, is also the most extensive and there are a variety of settings. Because included in the file system, then this file has hidden attributes (hidden) and read only (can only be seen can not be changed). For that to be changed, you must change the file attributes. Open Windows Explorerand select View menu> Folder Options. Select the View tab and click Show all files option. After that press the OK button. Then locate the file MSDOS.SYS system in the C: \. First previous backup file and save it on diskette. Then right click and select Properties. You will be confronted with the properties dialog box for the file MSDOS.SYS. In the attributes, clearing the Read Only and Hidden. Finally open the file with Notepad. Now let us begin to tamper with MSDOS.SYS. Anything you can maximize MSDOS.SYS in this setting? please wait for the next article.

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