in many applications:

in many applications:

in many applications. we need to access information in a more direct manner than sequential access devices allow. For example in a computerized bank at any instance it is required to determine the exact balance in the savings account of a particular customer. Similarly, in a computerized airline ticket booking system. immediate access may be required to reservation system records. to find out if seats are currently available on a particular light. in such application, if we use a sequential access device for data storage. the time taken to access the desired information may be enormous. causing frustration to the customer. Secondary storage devices exist, which permit access to the individual information, in a more direct or immediate manner, these (direct access devices) are also called random access devices, because (the information is literally), (available at random), i.e., is available in any order. Hence, a random access storage device is one in which any location in the device may be sleeted at random. Access to the information stored is direct. and approximately equal access time is enquired for each location, This is analogous to a music CD. if 10 songs are recorded on a music CD. and if you want to listen to or access. the 6th song. you need not listen to or fast for ward the 5 songs. which come before your favorite songs all you have to do is select track number 6 on the player. and the player directly moves the pickup arm across the CD to the groove where the 6th songs begin. and stats playing. Magnetic and optical disk of various types are examples of direct access storage Device.