The number of writes to raw disk devices.
.PD
.PP
and the default time format is `%Uu %Ss $E %P %I+%Oio %Fpf+%Ww'.
and the default time format is `%Uu %Ss %E %P %I+%Oio %Fpf+%Ww'.
Note that the CPU percentage can be higher than 100% on multi-processors.
.RE
.TP 8