The header information is always 24 characters in length. This header contains control information about the index record itself. The contents of this information are not important to this discussion, but you should be aware that these 24 characters are not available to hold actual data. You can notice that on different clusters, however, a different number of X's can appear on each line of the graph. This is because of the scaling factor that was used on the graph, which is based on the control interval size of the component (you can see both of these values on the print line that precedes the graph). With a control interval size of 4096 (we will see these values as CI size from now on), the scaling factor is 1/64. This makes the 24 bytes insignificant for graphing purposes, and will therefore not show up. On the other hand, a CI size of 512 produces a graphing factor of 1/8, and therefore three X's will be displayed to represent the 24 characters.
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