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What is disk interleaving? Why do you need ?

To speed up the read access of the disk, the sectors are arranged such that when the computer
finishes reading the sector, the disk head is on the position of the next sector to be read.
Interleaving, with disk-based storage, refers to the physical arrangement of data sectors on a
computer disk in such a way that sequentially read sectors are not necessarily contiguous. A disk,
especially a hard disk, usually spins so fast that the computer cannot process the data from one
sector before the next sector passes the head. Interleaving alternates sectors in a pattern that
increases the likelihood that when the computer is ready for the next sector in numeric sequence, it
will be the sequence just arriving at the head. For example, rather than being arranged in numeric
order (1, 2, 3, 4 . . .) on the disk in a 1-to-1 interleave (no intervening sectors), sectors might be
arranged in a 3-to-1 interleave pattern (1, 12,7,2,13,8,3 . . .), in which consecutive sectors are
separated by two others. Interleaving speeds access by reducing the average time the computer must
wait for the desired sector to arrive at the head. Interleaved sectors are arranged by the format
utility that initializes a disk for use with a given computer.
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