 This meant that an entire file could be read (or written) very quickly.A side effect of this file system structure was that, as files were created and deleted on a volume over time, the unused disk blocks would likely not remain contiguous, which could become the limiting factor in the creation of large files; the remedy was to periodically “squeeze” (or "squish") a disk to consolidate the unused portions.Each volume has only one directory which was preallocated at the beginning of the volume.