Are these 8 gigabyte drives causing a problem?

I have been looking at the performance of this machine for the last few hours.  Something is wrong.  I think it might be that the 8 gigabyte drives have enough storage space, but not enough arms.  Is 64 percent busy a big number?

What do I do now?

Charly Jones CSP

Geezer in Gig Harbor

                            Work with Disk Status                     KHUMBA    
                                                            01/17/01  10:31:57
Elapsed time:   00:05:01                                                      
                                                                              
             Size    %     I/O   Request   Read  Write   Read  Write    %     
Unit  Type    (M)  Used    Rqs  Size (K)    Rqs   Rqs     (K)   (K)   Busy    
 &nbs p; 1  6713   8589  83.5   64.2     11.0    26.8   37.4    4.1   15.9    51    
   2  6713   8589  83.5   41.5      5.2     6.6   34.8    4.4    5.4    38    
   3  6713   8589  83.5   38.0      5.2     3.8   34.1    4.6    5.2    35    
   4  6713   8589  83.5   71.3     11.0    18.9   52.4    4.0   13.5    64