WD 2TB Boxshot

WD Red 2TB ( WD20EFRX ) NAS HDD Review

  1. Introduction
  2. Specifications and Closer Look
  3. Test Bench and Methodology
  4. AS SSD Benchmark
  5. ATTO Benchmark
  6. AIDA64 Sequential Access Time
  7. Boot Load and DATA Transfer Test
  8. CrystalDiskMark Benchmark
  9. HD Tune Pro Benchmark
  10. PCMark Vantage x64 HDD Benchmark
  11. PC Mark 7 Secondary Storage Benchmark
  12. Conclusion

This is the –1TB Platter version of the WD30EFRX that is reviewed earlier. To re-quote my 30EFRX Red drive’s review:

WD has this error recovery feature that’s usually present in enterprise storage optimized for 24/7 operation (along with multiple features in Enterprise Storage that has no use for end users unless you’re doing a lot of hot-swapping while under operation) called TLER- Time Limited Error Recovery (other brands uses a different terminology). TLER corrects the corrupted data while still in RAID mode.One point to keep in mind is that, depending on the NAS drive that you use if TLER is unable to repair very complex errors within few seconds to the RAID system where the NAS controllers take care of it (I think pretty much all personal NAS use software level RAID to keep the cost low, maybe some SOHO use Hardware level RAID). If the RAID system is unable to correct it, you get an error message in your NAS OS. When you press Retry, the Hard drive’s TLER gives it a first drive and if cannot work out, the controller on the NAS kicks in. In any case, WD’s TLER runs in Software Level RAID and Hardware Level RAID.

As WD pointed out, Hard drives with TLER tries to correct complex error on its own since it assumes that there is a redundant storage array running in the background. Difference between does some level of error correction in the background of the drive and TLER is that TLER is more optimized for RAID. There’s also a chance that RAID systems with NON-TLER drives interprets an error when HDD is not able to hand over the error correction to the RAID controller. In this scenario and in this day of age, its not very practical to mix and match hard drives with non TLER support with NAS, NAS controllers with Rev versions varying from time to time. With this, you save the headache of doing that- or that’s how it should be for NAS optimized drives.

Another feature to note is the ATA streaming command that optimizes video streaming performance- for example if there’s a bad block and you’re streaming video from the NAS storage with these drives, it continues to stream the video to you rather than spending time to correct the bad block.


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