Two Level Directory in OS

A directory in a computer system is like a container, through which files and folders store data. Just like a room or space is required to keep goods in a shop, similarly a directory is required to store files folder in a computer. In this article, we are going to discuss two-level directories and also we will see their advantages and disadvantages. So, let's get started:-

What is a Directory?

In an operating system, a directory is a container that is used to store folders and files. It organizes all the folders and files hierarchically. In other words, “a directory is a collection of files on a disk.” Many users create thousands and millions of files in a file system. The directory structure is used by the file system to organize these files well.

What is Root Directory?

The single-level directory structure has only one directory which is called the root directory. In this, users are not allowed to create sub-directories inside the root directory. Files created by different users are stored only in the root directory.

What is a Sub-Directory?

Subdirectories are directories that sit inside other directories. They’re used to make a nested or hierarchical structure, basically folders within folders. Whenever you need to organize files and folders in a directory, use a subdirectory.

What is a User Directory?

In a Two-Level Directory Structure, you’ll find something called a user directory. This is space specifically set aside for a single user. Allowing them to manage everything they need. In it, they can create files and subdirectories just like any other directory. This provides them with a clear a concise area to work in. And it’s typically named after the respective user as an extra measure of clarity.

What is Directory Structure?

1000 files have to be created in any directory. Directory Structure is used to keep them well. Directory Structure is a structure. Which stores files and folders in an organized manner.

Directory structure holds a lot of information. Store in Directory Structure keeps the information of all the files and folders related to each other. Whenever a user searches for a file in the directory of the file system, he finds a match. If match is found. So Directory Structure shows a lot of information. About which I am telling below.

• File-name Shows the name of the file.
• Type – What are the categories of file? It shows.
• Location-info shows the complete location of the file.
• Protection-info By which user the file can be accessed. Shows its details.
• Flag — Shows the type of directory entry.
• Misc Info: Miscellaneous Information Shows in this. Like - when was the file created, date and time, when was the file modified, file owner details.

We get all this information from the file system. This is valuable information of the directory.

Two-level Directory Structure

In two level directory structure, user can create directory inside the root directory, but user cannot create sub-directory.

Through two-level file directory structure, each user can create his/her own directory and store files.

How Two Level Directory Works?

At the most basic level, there are unique user directories that are created for each user. In these directories users can make their own files and folders.

With this structure, users can access their stuff without worrying about other people’s stuff getting in the way.

Step by Step Implementation

To get the Two Level Directory Structure up, follow these steps:

a. Create User Directories: Start by making a user directory for each individual person and load it into the root directory. These folders will be special to them.

b. Organize Files: Now your users have the ability to save things like documents, images, and subfolders within their own folder.

c. Navigation: The final step is making it easy to locate their files. Simple enough, all they have to do is go through the root directory and select their personal folder.

So when everything’s done you should have something like this:

Advantages of Two level Directory Structure

• In this, different users can keep the same directory name and same file name.
• In this you can give complete path. /user-name/directory-name
• Path name and user grouping makes it easy to search files.

Disadvantages of Two level Directory Structure

• A user cannot share files with other users.
• It is not very scalable, because files of the same type cannot be kept in the same group.

Conclusion

The Two-Level Directory Structure is great if you have a small system and just wanna have some simple organization to your files. However when things start piling up, or you get into a lot of tasks it becomes quite limiting.