3. a) Explain the difference between a Text-documented and a DataRecord.
b) What are the functions of an Operating System?
c) Drawing a suitable diagram, describe the Directory and SubDirectory Structure.
Answers
Answer:
A. A file is a collection of records which have common properties. Each file has its own file reference which is unique. The file reference indicates the subject or contexts of the records.
A record can be an image, text based or in electronic or physical format.
B. An operating system is a software which performs all the basic tasks like file management, memory management, process management, handling input and output, and controlling peripheral devices such as disk drives and printers.
C.Tree Structured Directory
In Tree structured directory system, any directory entry can either be a file or sub directory. Tree structured directory system overcomes the drawbacks of two level directory system. The similar kind of files can now be grouped in one directory.
Each user has its own directory and it cannot enter in the other user's directory. However, the user has the permission to read the root's data but he cannot write or modify this. Only administrator of the system has the complete access of root directory.
Searching is more efficient in this directory structure. The concept of current working directory is used. A file can be accessed by two types of path, either relative or absolute.
Explanation: