Disk Insurance: Fault tolerance isn't an option; it's a necessity. Vaughan-Nichols, S. J. Byte Magazine, 16(8):195–202, August, 1991.
bibtex   
@Article{Vaughan-Nichols:1991:DIF,
  author =       "S. J. Vaughan-Nichols",
  title =        "Disk Insurance: Fault tolerance isn't an option; it's
                 a necessity",
  journal =      j-BYTE,
  volume =       "16",
  number =       "8",
  pages =        "195--202",
  month =        aug,
  year =         "1991",
  CODEN =        "BYTEDJ",
  ISSN =         "0360-5280 (print), 1082-7838 (electronic)",
  ISSN-L =       "0360-5280",
  bibdate =      "Thu Sep 12 18:39:30 MDT 1996",
  bibsource =    "https://www.math.utah.edu/pub/tex/bib/byte1990.bib",
  acknowledgement = ack-nhfb,
  classification = "C5320C (Storage on moving magnetic media); C6120
                 (File organisation)",
  keywords =     "Disk duplexing; Disk insurance; Disk mirroring; Fault
                 tolerance; Hard discs; Mass-storage systems; RAID;
                 Redundant arrays; System error; System failure",
  thesaurus =    "Fault tolerant computing; Hard discs; Storage
                 management",
}

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