nIndex area: e rst track in each cylinder is reserved for an index. is index describes the stor-
age of records on the various tracks of the cylinder.
nPrime area (Data tracks): e various records of the le are written on this area on a cylinder al-
ways starting from the 2nd track. e records are recorded sequentially along the various tracks.
e highest key on the track and the track address are entered into the index.
nOverow area: e area is created to accommodate the overowed records in the le. e over-
ow area is generally the last track on the same cylinder. is area is unoccupied at the time of
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