Performance Metrics and Power Consumption

The performance evaluation reports are organized under two categories: Standalone and NAS-based. In the latter case, we have two NAS systems which are not in the officially sanctioned list (LaCie 2big NAS and Netgear NV+ v2) and one recommended by WD as definitely compatible (Synology DS211+). As mentioned earlier, we present the equivalent performance numbers for the 3 TB Seagate Barracuda 7200 rpm drives. We make use of the standard single-client NAS testing methodology using NASPT / robocopy.

First, let us take a look at the HD Tune Pro benchmarks on the standalone drive.

The sequential access speeds vary between 59 MBps and 148 MBps depending on whether the outer or inner parts of the platter are being accessed. 4KB random accesses aren't going to win any performance benchmarks (the numbers reported by HD Tune Pro above aren't directly comparable with what we have reported using IOMeter in other HDD reviews).

The following graphs summarize the results from our NAS testing. In all configurations, the drives were put in RAID-1.

In order to put the final two graphs in perspective, we note that the standalone WD Red (freshly formatted) connected to a SATA 6 Gbps port of the Asus P8H77-M Pro delivered 130.07 MBps in the write test and 137.46 MBps in the read test. In the NAS systems, the WD Red performs quite well, particularly in the Synology DS211+. It does lose out to the Seagate 3TB hard drives under some circumstances. However, one can safely say that in 2 - 5 bay NAS systems based on ARM chipsets, it is unlikely that 7200 rpm drives are going to consistently deliver better performance than the 5400 rpm / IntelliPower drives.

In order to get an idea of how much power savings one can expect from using these drives, we took the LaCie 2big NAS and ran the disk performance bench using both the Seagate and WD drives in RAID-1 configuration. The following table summarizes the power consumption under various operating modes.

LaCie 2big NAS Power Consumption
Mode Seagate 3 TB WD Red 3 TB
Sleep 7.7 W 7.7 W
100% Read 20.6 W 14.8 W
60% Rand, 65% Read 21.2 W 15.9 W
50% Read 20.9 W 14.9 W
Rand 8K 70% Read 20.6 W 14.7 W

It is interesting to see that the WD Reds consume just slightly more than two-thirds the power of the 7200 rpm drives when subject to similar accesses over the network. Of course, one might say that 7200 rpm drives such as the Seagate one we used above are not suitable for NAS applications at all. However, note that LaCie had in fact bundled them with their 2big NAS with the OS pre-installed.

WD Red Lineup: Differentiating Features Stress Testing and Effects of Prolonged Usage
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  • vgray35@hotmail.com - Saturday, August 18, 2012 - link

    Good reliability and low power consumption is my first criteria, but the latter cannot be used to sacrifice the former. Both criteria lead to longer life cycles. The lower power GREEN and BLUE drives are designed with an eye towards rather low cycle life, and therefore low power as a criteria for these drives makes no sense whatsoever. It seems the only way to get reliability is to stay away from cheap low end consumer hard drives which is most of the drives out there.

    To me I do not differentiate between standalone, external storage, second hard drive, desktop or laptop, as these all demand good reliability and low power consumption for the best possible price. Performance is the next important criteria, but it is a fallacy to expect good performance from a 5400 rpm low power drive, and I no reason why the minimum spindle speed should not be 7200 rpm. Lower spindle speeds appear largely in the realm of low end consumer drives where reliability is very poor. Hard drive crashes plague the computer world because the majority of products are bad in the extreme, long lasting cheap consumer drives in some configurations notwithstanding. Just because someone says that they obtained a 3 year life span with cheap consumer drives, does not make them good drives generally, because that long life example is not typical for the majority of real world usage conditions. I now have a lower boundary criteria - "if it does not last in a laptop then it is not good for any purpose bar none".

    So all this translates to never buy anything less than 7200 rpm to ensure a good shot at performance, and search for good drive designs with the lowest power consumption to have a good shot at longer life spans in any situation. Picking a low power drive simply to achieve low power drain, is more often than not the same thing as purposely selecting a LOW quality drive in terms of performance and cycle life, and such a definite requirement is very rare indeed. Why bother - extremes of low power means low performance, and often also very short cycle life.

    There is very rarely a situation which does not demand extremes of temp cycling of the hard drives, which is what will lead to shorter life spans and hence poor reliability. I have come to the conclusion the classifications of standalone, external storage, 2nd drive, laptop, etc are not particularly useful if reliability and performance are important - and since when are these never important. These classifications have become justifications by the manufacturers for designing - "only as good as needed" devices. It is an excuse for designing crap product

    Western Digital BLACK or RED is a minimal consumer drive quality level to be used in any application, and anything less reliable should never be graced with your dollars. Less reliable drives lasting for years in some particular situations is largely a myth - it happens only if certain criteria are meet, namely, low loads and small temp cycling, which rarely occurs in the real world of consumer computing. When looking at Western Digital drives, always stay away from GREEN and BLUE drives, simply because components are designed to last only under certain special conditions, and I believe these special operating conditions in practical terms are just a myth. In essence these manufacturers (marketing honchos) give credence to conditions of "LOW THERMAL CYCLING", which they then decree is a significant portion of the market place, when in reality it really does not exist, and only gives them an excuse to design "only as good as needed" devices. The existence of the low quality drives permits them to charge more than they normally could for the better drives. Don't believe the hype, the more expensive drives are required for good reliability and performance. apparently good news about GREEN and BLUE drives notwithstanding.

    Don't ever buy too cheap, if you want to avoid repeated disk crashes, and there is nothing wrong with periodically replacing working drives with new ones periodically to avoid the inevitable disk crashes. Even good drives eventually fail. If the manufacturer specifies a 3y warranty, then replace the drives every 2 years.

    You asked for advise on selecting drives, but what I am giving you really reads as a recipe for spending more money. You will not regret it.

    What does "Drives certified for 24/7 really mean?" It means better able to handle temperature cycling arising from inadequate cooling or heavier loads, while still permitting reasonable cycle life. Reliability comes from 24/7 certification, with drives designed to handle extremes in both peak temperature and temp cycle, and drives not so certified belong to the mythical world of operating conditions where thermal cycling is less important. I have to realize all situations require 24/7 certification and to believe otherwise is a risky business.

    So buy BLACK drives for all your applications as a minimum and occasionally you will need RED for better reliability. Personally I reckon RED only for me after prices have settled in the months ahead. I wonder if they make 2.5" RED drives.
    Reply
  • Peroxyde - Saturday, August 18, 2012 - link

    Thank you very much for the thorough explanation. With too much emphasis on NAS usage with the Red, I am still wondering if technically they can still function as a single drive outside of a NAS. Should people who don't have NAS device avoid buying the RED drives?

    Let's try a real example:

    USB 3.0 External Drive: I hesitate between Caviar Black 1 TB, 5 years warranty, $100 et WD Red 2 TB, 3 years warranty $140. I am torn between the 5 years warranty of the black and the 2TB of the red. Reliability is the most important. This external drive will travel often and will be frequently powered on/off. What would you choose?
    Reply
  • vgray35@hotmail.com - Saturday, August 18, 2012 - link

    BLACK is cheaper but quality is a lot better than GREEN and BLUE, and BLACK may well be a good choice reliability wise.

    If RED is good for multi-drive RAID.operation, then it is definitely very good in terms of reliability in single drive applications. The 5 year warranty on BLACK seems a better deal right now. RED is new and needs time to unravel its true nature. BLACK has 300,000 load/unload cycles while RED is rated at 1,000,000, but the BLACK drive draws a lot less power. I would go with BLACK's 5y warranty instead of RED's 3y warranty

    Make sure you have enough cooling and you know the drive's temperature during heavy loads.

    Reply
  • Peroxyde - Saturday, August 18, 2012 - link

    Cool thx. BTW, In the example above Black is not cheaper. It costs $100/TB while the Red is $140 for 2TB. I'll follow your advice, will buy the 1TB Black for now. Reply
  • vgray35@hotmail.com - Tuesday, August 21, 2012 - link

    I have just read the SPCR review of RED drives, and these may well be a better choice all round over the BLACK drives, especially given the energy efficiency numbers, and the fact that 7200 rpm drives are not able to consistently outperform these 5400 rpm RED drives.

    Note that the 1T RED drive performance is quite a lot less than the 3TB drive, but is more energy efficient. The 3TB performance is good.

    That RED 3y warranty is likely based on a NAS configuration (a harsher environment), which means a standalone drive is likely approaching a 5y warranty equivalent. I am beginning to change my mind on that BLACK drive purchase even with that 5y warranty.

    http://www.silentpcreview.com/WD_Red
    Reply
  • Watwatwat - Saturday, August 18, 2012 - link

    Of course they function like any other drive outside of nas.

    worrying too much about reliability misses the point, you should buy two because one will fail with your data, its just a given, you need backup. don't buy yourself a false sense of security.
    Reply
  • vgray35@hotmail.com - Monday, August 20, 2012 - link

    I agree. Use that 2nd hard drive to replace the 1st drive BEFORE the warranty runs out, regardless of whether the 1st drive still seems OK.

    When you buy higher reliability drives this is not false security, just good business. False security is when one fails to also use backups.

    Using backups, and hope that cheap GREEN and BLUE drives will be mitigated is a false hope. Recover from a failure is invariably always a very expensive proposition.

    Isn't buying two the point about satisfying that worry? Backups are always a pain, cost money and time, and are painful when you have to resort to using them. Changing drives early invariably affords less pain.
    Reply
  • SunLord - Saturday, August 18, 2012 - link

    WD Red is un-gimped Raid friendly version of Green drive just like the RE drives are un-gimped raid friendly versions of Black drives. The only real differences between Red and Green is the firmwares they ship with having different settings the internals are all identical just like it is with Black and RE drives. I will admit the I've not taken apart a red drive but I have taken apart a Black and RE 1TB drives made with in 3 weeks of each other and they were 100% identical save for the stickers any Reply
  • vgray35@hotmail.com - Monday, August 20, 2012 - link

    And yet experience under load yields a different result, despite the fact that they look the same inside. There is something else afoot here besides firmware. Reply
  • Dzban - Saturday, August 18, 2012 - link

    1. Any good recent 7200 RPM drive
    2.same
    3.same but you could use "green" type drive if you would store
    not frequentlyu used files like media
    Reply

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