disk overhead

Noun
  1. (computer science) the disk space required for information that is not data but is used for location and timing (synset 108573602)
    referred to in: computer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures
    is a type of: disc space, disk space - (computer science) the space available on a magnetic disk
    same as: overhead

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