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  2. Hard disk drive failure - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive_failure

    A head crash, one type of disk failure. The platters should normally be smooth in modern drives, and a head crash results in partial to total data loss, as well as irreversible damage to the platters and heads. Particles may also be liberated during this process, making the insides of the drive not clean enough for operation.

  3. Champaign County, Illinois - Wikipedia

    en.wikipedia.org/wiki/Champaign_County,_Illinois

    Its area is 998 square miles (2,580 km 2), of which 996 square miles (2,580 km 2) is land and 2.1 square miles (5.4 km 2) (0.2%) is water. [6] It is the fifth-largest county in Illinois by land area. Because Champaign County is situated on a large and very flat plateau , it had virtually no natural drainage, so that much of the County consisted ...

  4. C-4 (explosive) - Wikipedia

    en.wikipedia.org/wiki/C-4_(explosive)

    C-4 or Composition C-4 is a common variety of the plastic explosive family known as Composition C, which uses RDX as its explosive agent. C-4 is composed of explosives, plastic binder, plasticizer to make it malleable, and usually a marker or odorizing taggant chemical.