physical file system in operating system

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2. Physical F ile system By Priya.G s

3. FILE SYSTEM resides on secondary storage ( disks) Provide efficient and convenient access to disk by allowing data to be : CREATE OPEN WRITE READ CLOSE DELETE

4. PHYSICAL FILE SYSTEM LOGICAL FILE SYSTEM FILE ORGANIZATION MODULE BASIC FILE SYSTEM I/0 CONTROL DEVICES STRUCTURE OF A FILE

5. PILE DIRECT FILE SEQUENCIAL FILE INDEXED FILE TYPES OF PHYSICAL FILE SYSTEM

6. THE PILE Datas are collected in the order they arrive. Records may have different fields. Record access is by exhaustible search. Purpose is to accumulate the mass of data and save it. Least complicated form of file organization

7. SEQUENCIAL FILE SYSTEM Records are stored and retrieved serially one after t he other. The files are searched from its begging until the requested record is found. If the record not matched on search then record not found is sent to the user. File name and length are attributes of the file.

8. INDEXED FILE SYSTEM Records are accessed only through their indexes Variable length record can be employed. Exhaustive index contain one entry for every record in the main file Partial index contain entries to record where the field of interest exists

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