A measure of the extent to which system heap is fragmented. This value is calculated from the total heap available and the largest block of heap available in the following way: Fragmentation = 100 * (1 - (LargestBlock / TotalAvailable)) Thus if the largest block available is equal to the total amount of memory available, fragmentation would be said to equal 0%. Fragmentation increases as the ratio of largest available block to total memory available decreases.