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Sequential access: Memory is organized into units of data, called records. Access must be made in a specific linear sequence. 

Direct access: Individual blocks or records have a unique address based on physical location. Access is accomplished by direct access to reach a general vicinity plus sequential searching, counting, or waiting to reach the final location. 

Random access: Each addressable location in memory has a unique, physically wired-in addressing mechanism. The time to access a given location is independent of the sequence of prior accesses and is constant.


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Well explained, but a clear clarification could be helpful on random access mode
by (user.guest)
Thanks for the feedback. Below is a clearer explanation of how the Random memory access works:

Random Access is transferring information to or from memory in which every memory location can be accessed directly rather than being accessed in a fixed sequence. In Random Access Each record or addressable location in memory has a unique address. So any location can be selected at random and directly accessed and addressed. Example: Main Memory and Cache Systems.

Best of luck in your studies :)

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