allocation unit vs arrangement

allocation unit

noun
  • Synonym of cluster (“data storage unit”) 

arrangement

noun
  • A particular way in which items are organized. 

  • An agreement. 

  • Preparations for some undertaking. 

  • An adaptation of a piece of music for other instruments, or in another style. 

  • The act of arranging. 

  • A collection of things that have been arranged. 

  • The manner of being arranged. 

How often have the words allocation unit and arrangement occurred in a corpus of books? (source: Google Ngram Viewer )