#sector.computer_memory_unit  the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes
  supertype:  #computer_memory_unit  a unit for measuring computer memory
  part of:  #block.computer_memory_unit  (computer science) a sector or group of sectors that function as the smallest data unit permitted; "since blocks are often defined as a single sector, the terms `block' and `sector' are sometimes used interchangeably"
  part of:  #allocation_unit  a group of sectors on a magnetic disk that can be reserved for the use of a particular file

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