File Management in Operating System

 


File Management in Operating System


In this article I take a brief look at how an application (OS) interacts with files.


Its data collection is usually stored on a second storage device such as a hard disk or floppy diskette.

The OS should provide multiple file-related functions so that users can store and secure data securely.

The most common tasks are:

Open

Close

Create

Copy

Rename

List

In addition, the performance of a single data object within a file is supported by:

Read

Write

Search

Files Control Files

File control blocks (FCB), sometimes called file adjectives, are data structures that contain information about a file. When the OS needs file access, it creates a compatible file control block to manage that file.


The file control block structure varies between applications, but most file control blocks include the following components:

Name

Location on secondary storage

Height

Date and time or create or last access

Naming a name

Each OS uses a specific assembly or naming practice.

MS-DOS uses eight characters, a dot, and a three-letter extension that describes the file type. File names are not sensitive to charges.

UNIX file names can be up to 254 characters long and are sensitive to charges.

Windows Filenames can be up to 255 characters long and are not sexually sensitive.


Types

Genres refer to classification of file content, such as program, text, operating system or data.

For Windows applications, the type is based on the file name extension. The most common types and their extensions are:

Extension

Type

. foundations

basic source system

.c

Source system c

.dll

system library

.doc

Word document

.exe

operating system

.txt

text

Windows associates programs (programs) with certain types. For example, an automated application that opens to process type.txt is a Notepad editor.

How the operating system saves files

A hard disk has a number of categories specified in sequence. As files are made, free domains are assigned to capture their content and are marked as shared.

To keep track of categories and whether they are shared or free, and in which file, the OS maintains multiple tables.

Root file system

When the OS is first installed, it creates a root file system on the disk that specifies how many domains are available and how they will be shared.

The root file system is a table of entries as a reference. Generally, this is the default size, and once full, no other entries can be added.Each install can be a file or other index table.

Installation of Root file system

This program is very effective, but the entry may be visible,

Name

Starting collection number

Length in bytes

Type

Modified creation and last reservation date

permissions (access control list)

Comments

Post a Comment

Popular posts from this blog

Education and covid-19

  Education is the backbone of every society.  Now a days this backbone of society is getting weaker and damaged due to pandemic. People of the world are frightened to send their childern to schools, colleges and also universities. Developed countries, developing country and underdeveloped countries all are facing a huge disastrous of education.  Most countries have started online classes but this is not enough and not a full compansation for physcal learning of education.  No doubt corona virus(covid-19) is killing educaion and llves of human beings.  Now need of hour is that we shall have to fight against this pandemic, we shall have to change our life styles so as we could promote our education. Plz give your opinion to overcome and compensate our education 
Read more

Parent teacher meeting for betterment of students

Meeting of teachers and parents for the welfare of studens. Although there are many strength and weakness within the education system of Pakistan and also  the efforts made to enhance this education system are considered unsatisfactory.  One of the main reason for this insufficient effort is the economic aspect of this country. It is different matter that the deeds of the beloved homeland offer very little budget on education.  However, in the view of these scare resources we need to take steps to achieve maximum and better results with minimum expenditure.  Purpose of this text and other similar articles to find a few projects that can help us improve the education and training of students and teachers.  However keep in mind that due to lack of time and space. This topic is summarized below. Term PTM (Parent-Teacher meeting) is used for above article. This term PTM is used exclusively by both Govt and public sectors. Actually, after six month, after three month, monthly or weekly PTM
Read more

Beauty, Quality and Reality

  Three things are important in our life. These are Beauty, Quality and Reality. Beauty Beauty is important but it is temporary. We cannot choose a beautiful person as our prime minister or president. We cannot go to a beautiful peron for treatment of illness without quality of a doctor. Quality Quality is also very important. If someone has qualification of doctor we shall go for treatment if someone has quality of engineer we shall concert for building and so on.... But quality is also temporary thing because qaulity lasts so long as someone is alive or he/she possesses some qualification.  Reality But reality is the most important. Reality is that we don't come and die in this world without the will of GOD. Reality is that our beauty and quality is controlled by ALLAH. Reality is that this world is temporary and permanent is only ALLAH. 
Read more