Information is typically stored on disks in small pieces referred to as sectors or blocks. Matching the sector interleave to the processing speed therefore accelerates the data transfer, but an incorrect interleave can make the system perform markedly slower. Interleaving was used to arrange the sectors most efficiently, so that after reading a sector, time is allowed for processing, and then the next sector in sequence is ready to be read just as the computer is ready to do so. Modern operating systems do not use interleaving for, e.g., paging files.
Interleaving was common prior to the 1990s, but faded from use as processing speeds increased. The purpose of interleaving was to adjust the time difference between when the program was ready to transfer data, and when those data were actually arriving at the drive head to be read. Ordering block storage on storage devices such as drums, floppy disk drives and hard disk drives.Minimizing missed rotations between instructions on computers storing instructions on a drum memory.Low-level format utility performing interleave speed tests on a 10-megabyte IBM PC XT hard drive
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