Disk drive mapping entries of a defect list into clusters

A disk drive is disclosed comprising a first and second disk surfaces. A defect list is generated comprising a plurality of entries, wherein each entry comprises a track number comprising a defect. A first cluster across the first and second disk surfaces is identified, wherein a maximum data track number X1 in the first cluster on the first disk surface is less than a maximum data track number Y1 in the first cluster on the second disk surface. A second cluster across the first and second disk surfaces is identified, wherein a maximum data track number X2 in the second cluster on the first disk surface is less than a maximum data track number Y2 in the second cluster on the second disk surface. An entry from the defect list is selected in response to X1, and the entry of the defect list is mapped into the second cluster.