Western Digital Red WD30EFRX, Green WD20EARX, WD20EARS, WD30EZRX


Product Line

  • WD Caviar Blue => Value and reliability for everyday computing
  • WD Caviar Green => Cool, quiet, eco-friendly (slow rotation, 5400 rpm)
  • WD Caviar Red => NAS-Specific (seems to be Green without spindown, no RVS)
  • WD Caviar Black => Maximum performance for power computing


WD${NN} for ${NN} 100-GB (e.g. 30 is 3TB)


  • EAR => Green
  • EFR => Red
  • WD30EARX => SATA 6Gb/s
  • WD20EARX => SATA 6Gb/s
  • WD20EARS => SATA 3Gb/s



Based on information and belief

  • Manuel Masiero, Achim Roos; Western Digital Red: NAS-Specific SATA 6Gb/s Drives, Reviewed; In Tom’s Hardware; 2012-07-23.

    • It’s a benchmark and spec recitation article
    • Enterprise and nearline drives
      • Characteristics
        • Up to five platters
        • Spin at 7200 RPM or more.
        • Have rotational vibration sensors (RV, RVS)
        • Operate up to 8760 hours per year (equivalent to 24×7).
      • Examples
        • Hitachi’s Ultrastar
        • Seagate’s Constellation
        • Western Digital’s RE4 family.
    • Desktop drives
      • Characteristics
        • 2400 power-on-hours per year
      • Examples
        • Seagate’s Barracuda 7200.14
  • StephenB; Re: WD20 EFRX: Claim To Fame?; In NETGEAR ReadyNAS Forum; 2013-01-30.
    <quote>The RED drives don’t have RVS, they do have a “3D Active Balance Plus” feature that WDC claims reduces vibration. RVS is usually only found in enterprise-class drives, which are quite a bit more money than the REDs.</quote> 

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