There are many ways in which storage can be categorized. They are broadly classified as primary and secondary storage. The main purpose of the storage devices is to maintain records, those which contain information of a personal or commercially confidential must be stored securely is the main purpose of the storage devices. Offices or cabinets containing such records must not be left unlocked and unattended. Records that have been removed from their usual storage must be secured at their temporary location to an equal or better standard. Electronic Record Keeping Systems Procedures should be put into place to ensure that confidential records are properly restricted. There are several techniques such as primary access to the CPU. The other techniques are random access which is based on reading the memory.

The storage is used for different purposes, and most computers contain several types: they are primary, secondary, and volatile. The secondary storage is used in the multiprogramming environment. The user has a detachable storage media such as cards and tape which can become highly undesirable. If users are able to retain as much information as they wish in machine accessible secondary storage.

The information should be easy to access when required, it must be safe from accidents, and it should be accessible to other users on an easily controllable basis. Finally, any consideration which is not basic to a user's ability to manipulate this information should be invisible to him unless he specifies otherwise. The basic formulation of a file system designed to meet these needs is presented here. This formulation provides the user with a simple means of addressing an essentially infinite amount of secondary storage in a machine-independent and device independent fashion.

The basic use of secondary storage devices is to save the file system, and is not seen by the user. The hierarchical structure of files also permits flexible use of the system. The structure has sufficient capabilities to assure versatility. A set of representative control features is presented. Typical commands to the file system are also indicated, but are not elaborated upon; although the existence of these commands is crucial, the actual details of their specific implementations may vary without affecting the design of the basic file structure and of the access control.

The file backup system makes secondary storage appear to the user as a single essentially infinite storage medium. The backup system also provides for salvage and catastrophe reload procedures in the event of machine or system failure. Finally when the storage fails then there is a heavy loss of the revenue to the business or organization. So, the care should be taken in order to maintain the storage system and it is a good habit if we use the backups for the systems. If at all the hard disk or the memory gets damaged the backup cannot cause any serious problem to the business.

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