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The acronym HDI stands for:

  • A.Half duplex interface
  • B.Hard disk interface
  • C.Head to disk interference
  • D.Help desk interference

Answer: D

Correct answer: Head to disk interference

HDI is head-to-disk interference - contact between the flying head and the platter, which is what a head crash consists of. The heads normally fly a fraction of a micron clear.

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