What is difference between unit delay and data store blocks?

Please explain what is difference between unit delay and data store blocks such as data store read and data store write?

Answer 1

[KALYAN ACHARJYA]

As per Mathworks libary file Definations (Purpose):

Unit Delay: Implement a delay using a discrete sample time that you specify. The block accepts and outputs signals with a discrete sample time.

Data Store Memory (Memory Block): Implement a delay by one major integration time step. Ideally, the block accepts continuous (or fixed in minor time step) signals and outputs a signal that is fixed in minor time step.

Read here more and unit delay.

[Tong Zhao]

Can you explain more about the difference between "discrete sample time that you specify" and "one major integration time step"?