04-25-2002
Actually, that is not correct. Data blocks may not be contiguous. When a file grows and needs a new data block unix will try to find one nearby. But it's willing to take any data block if it must. Think about the case where a program runs away and writes a file that completely fills up the file system. That file had to use every available block. It will be severely scattered. Normally we call such a file "fragmented", which means that the blocks have been allocated all over the disk. Don't confuse that with "fragments" which are pieces of a block allocated to the end of a file.
Modern disks have a variable geometry and its no longer possible to tune the rotational delay to be optimal for the entire disk. But in the old days the rotational delay was used to help ensure that disk blocks were never contiguous in a physical sense. That was because unix could not issue the next read in time before the next block rotated away.
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