CPU and I/O Overlap

This section reports the CPU and I/O overlap statistics collected by the PSDCTIMER.EXE timer driver.

CPU+IO Idle: The percentage of time that the CPU and all disk devices were idle.
CPU Only: The percentage of time (non-overlapped CPU time) that a CPU was busy, and no disk device was busy.
I/O Only: The percentage of time that the CPU or all CPUs in a multiprocessor system were idle and at least one disk device
Multi I/O: The percentage of time that two or more of the disk devices were busy.
CPU+IO Busy: The percentage of time (overlapped CPU and I/O time) that both the CPU (at least one CPU in a multiprocessor system)and at least one disk device were busy.

Note: CPU and I/O overlap statistics are not available if the PSDCTIMER.EXE driver was not loaded when data was collected.