Question

Difference between direct and indexed sequential file organization

Answer 1

it’s quite simple a direct file is accessible directly by going to the exact physical location of it’s storage while an indexed file has to store the indexes as well as data.

Indexed file uses unique set of numbers or characters which are used to identify the data.

Answer 2

A better term for "random access" would be "direct access," since the hardware allows you to retrieve data anywhere on the disc. It is really quite useful! As for "sequential access," the hardware is only capable of running through a each piece of data from start to end, and although it may be faster to sequentially retrieve data that is near the beginning of that sequence, it can become incredibly slow if it you want to retrieve a piece of data near the finish of that sequence, since the process has to iterate through each piece of information.