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Meaning of disk I/O counts?

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The Question is:

 
I try to use MONITOR CLUSTER to monitor our %CPU %MEMORY and disk I/O rate ,
for both %CPU and %MEM we satisify what we gets from this command .But we
 didnot know what is the exactly unit of disk i/o.
Could you please explane the exactly meaning of disk I/O operation request and
 its unit.
Regards,

The Answer is :

 
  The unit is the number of I/O requests sent to the device.
  This can be more or less than you might expect, based on the
  involvement of I/O caches and of the file system activity.
 

  
     
     answer written or last revised on ( 14-JUN-2000 )
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