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?