In Task Manager (and Sysinternals' Process Explorer) there are columns called "I/O Reads", "I/O Writes", "I/O Read Bytes" and "I/O Write Bytes". So what do these counters mean exactly? What else, besides disk and network activity, do they include?
In Process Explorer I see a number of processes which have zero "Disk Read Bytes" and "Network Receive Bytes", but a non-zero "I/O Read Bytes". And conversely, some processes have a "Disk Read Bytes" value larger than "I/O Read Bytes". How is this possible?
Best Answer
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:
What does I/O data mean?
Source Trying to understand Process Explorer's I/O data