What is disk IO?

Refers to the input and output of the disk （Input and Output Abbreviation ）.
read / Write IO, The most common saying , read IO, Is to give instructions , Read the contents of a sector from disk . The instruction is generally to inform the disk of the start sector position , Then give the number of consecutive sectors that need to be read back from this initial sector , At the same time, the action is to read , Or write . The disk receives this instruction , Will follow the instructions , Read or write data . This command from the controller ＋ data , Just once IO, Read or write .