#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"
  supertype:  computer_memory_unit  a unit for measuring computer memory
  subtype:  bad_block  (computer science) a block (usually one sector) that cannot reliably hold data
  part:  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

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