What does "I/O Reads or Writes" and "I/O Read Bytes or Write Bytes" mean?

Solution 1:

How is it possible that I have a process with 4 MiB "I/O Read Bytes" and zero "Disk Read Bytes"?

I/O Read Bytes is more than just Disk Read Bytes:

• It includes File, Network and Device I/O
• It does not include Console I/O

I/O Read Bytes - The number of bytes read in input/output operations generated by a process, including file, network, and device I/Os. I/O Read Bytes directed to CONSOLE (console input object) handles are not counted.

What does I/O data mean?

I/O Columns of Process Explorer

• I/O Delta - The change in I/O operations since the last measurement

• I/O Delta Bytes - The change in I/O bytes since the last measurement.

• I/O Other - The number of input/output operations generated by a process that are neither reads nor writes, including file, network, and device I/Os. An example of this type of operation would be a control function. I/O Others directed to CONSOLE (console input object) handles are not counted.

• I/O Other Bytes - The number of bytes transferred in input/output operations generated by a process that are neither reads nor writes, including file, network, and device I/Os. An example of this type of operation would be a control function. I/O Other Bytes directed to CONSOLE (console input object) handles are not counted.

• I/O Read Bytes - The number of bytes read in input/output operations generated by a process, including file, network, and device I/Os. I/O Read Bytes directed to CONSOLE (console input object) handles are not counted.

• I/O Reads - The number of read input/output operations generated by a process, including file, network, and device I/Os. I/O Reads directed to CONSOLE (console input object) handles are not counted.

• I/O Write Bytes - The number of bytes written in input/output operations generated by a process, including file, network, and device I/Os. I/O Write Bytes directed to CONSOLE (console input object) handles are not counted.

• I/O Writes - The number of write input/output operations generated by a process, including file, network, and device I/Os. I/O Writes directed to CONSOLE (console input object) handles are not counted.

Source Trying to understand Process Explorer's I/O data