Đăng bởi admin 24/05/2016 0 Bình luận NEWS,

Just to get this out of the way: I’m not getting paid by WD or anyone for this blog post. I’m still a penniless student slacking around occasionally doing something that can be considered somewhat productive like twice a week.

Anyway, let’s get to the point. Even though HDDs are dying and SSDs are rising fast, today I decided to write a blog post describing the basic differences of the consumer / small business “color” HDDs from Western Digital, as far as I can understand it, because one of my friends asked me about Black and Green recently and he mistook their characteristics. As you should’ve known, Western Digital’s consumer series currently has 5 “colors”: Blue, Green, Red, Purple, and Black. (There’s also Red Pro but I’ll discuss it together with Red). Blue is marketed as being the default drive, Green the eco-friendly drive that I’m still not sure why so many people care about, Red the NAS/RAID drive, Purple the surveillance drive, and Black the performance drive for badasses who probably use Corsair RAM and value qualities that can’t be easily seen over money. Anyway, these advertisements range from barely-passing to better-than-marketed, and I’ll explain why.

So here we go, onto the basic drive that you should actually care about, and not just because of its cheap price: WD Blue.


WD Blue

And don’t pretend to be special while choosing WD drives, seriously. If you don’t REALLY need any of the quirky features of the other color drives, then just go with the Blue like everyone else. Why?

Because it’s nearly as fast as the Black.

Don’t believe me? Here’s a screenshot from Userbenchmark:

Wow, of course the Black is faster… by a staggering TWO PERCENT! Of course, the Black has other benefits that I’ll discuss later, but speed-wise, which is the thing most people care about, it’s quite shocking that the “default” drive performs just about as well as the top drive. Now, I know that Userbenchmark may not be an “official” benchmark results source, but it fares pretty well in comparing one part to another, and even if you don’t believe Userbenchmark, just search for reviews of the WD Blue. Out of all the reviews and benchmarks I’ve seen, the Blue is always very close to the Black “performance”-wise.

Thus. the Blue drive is the cheapest drive of the 5, and yet it’s the second fastest. If you’re just a normal user, I reckon you won’t see any reason not to go for that. But why is the Blue so cheap, then? Well, the reason is actually pretty simple: there’s no special tech inside it.

While the Green has technologies that ensure it always uses the least power, the Red has technologies that ensure it works well when interconnected with other drives of the same kind, etc. The Blue is just… a drive. That works well. They don’t need to care what demographics it’s aimed at, they don’t need to care what technologies it should have, they just need to make a drive that works at competitive speed and has decent capacity. That’s why it’s cheap.

UPDATE: WD added capacities of up to 6 TB for the latest series of the Blue drives (the WDxxEZRZ series), so this no longer holds true. Meanwhile, the most spacious Green, Red and Purple drives are now 8 TB large, and the most spacious Black drive can now hold 6 TB. However, the largest 7200 RPM Blue drive is still only 1 TB large.

So, to summarize, my opinions on the Blue are:


It’s the cheapest series from WD.

Doesn’t really lose to anything in terms of speed (in the consumers HDD segment, of course).


Doesn’t have anything special, if you do need it.


WD Green

…and gives absolutely zero *censored* to anything but capacity.

Now, the Green costs about the same as the Blue for the same capacity, but in some areas, like mine, it costs just a little bit more, so I’m gonna count it as the second cheapest drive in the group. But first, let’s look at its “performance” compared to the Blue:

Wow, that sucks. Ok, so what does the Green have going for it?

Well, first, it fixed the Blue’s main problem: the Green series has drives with up to 8 TB of capacity.

Besides, the Green is focused on “cool, quiet, eco-conscious” operation. But what does this all mean?

…Basically, it means that the Green will try its hardest to use as little power as possible.

Naturally, “power-saving” is part of “eco-conscious”, and using less power will cause the drive to spin less aggressively, leading to less heat and noise.

But wait a sec, isn’t that a good thing? I mean, the environment is in a grave situation right now. Just think of the cute pandas and the poor children in India! Plus, the electricity bill is getting more and more expensive by the day…

…Well, thing is, your hard drive most likely doesn’t use that much power in the first place, so saving a few percents of that power won’t help things. If you really want to save power then you’d actually be better off opting for a more efficient graphics card or turning off your AC while gaming… that’d help a lot better.

Plus, do you know what does less power actually means for computer components? It means less performance.

But we have already covered that. So what else?

…Absurd failure rates.

Well, while I don’t have the exact numbers, and I’m sorry for that, there are apparently many complaints about the WD Green failing early on online markets such as Newegg or Amazon. Or, even if it’s not failing, it’s more prone to cause drive errors and BSoDs than the other drives. Plus, it’s on QNAP’s “Not recommended” list of hard drives (or at least, the old version (EAxx) is). So, using a Green drive is like using a Seagate drive (yes, Seagate is more prone to failure than WD), except even worse: you always stand at the risk of being kicked out of your work, or seeing your drive suddenly looking as dead as your face when you realize you don’t have a backup.

Oh, and another thing, the Green has “IntelliPower” RPM, which basically means it’ll have a random spin rate between 5400 RPM and 7200 RPM… mostly at the lower portions. You know, to save power.

Thus, to sum up, my opinions about the Green are:


Uses less power

Has options with up to 6 TB of capacity


Lowest performance of the group

More erroneous than average


WD Black

The Black is the most expensive drive of the five (if you don’t count Red Pro), and it’s also marketed as having the best performance of all. But as we’ve covered, the Black’s “performance” is actually not much better than the Blue, the cheapest drive. So, what’s the Black’s excuse for being around 50% more expensive than the Blue?!

Well, for starters, the Black has as much as FIVE years of warranty, which is the longest of the bunch, much better than the two years of the Blue and Green, or the three years of the Red and Purple.

But more importantly, the thing that makes the Black special is actually not speed (though it DOES have the fastest speed out of the five, strictly speaking), but stability. First, let’s look at the Black’s advertised technologies again:

Vibration Control Technology: Adapt to mounting problems or vibration conditions inside the case.

StableTrac: Automatically stabilizes the platters for more accurate tracking.

High Resolution Controller: Increases data precision across the hard drive (not sure how this one works…)

Corruption Protection Technology: Protects and limits the potential problem of data loss during power failure or power loss to the hard drive

Dynamic Cache: Optimizes cache allocation between reads and writes, reducing congestion and improving overall drive performance.

NoTouch Ramp Load Technology: The seeking head never touches the platters.

Do you see anything in common in those “technologies”? Well, you should’ve noticed that all of those technologies aim for “more precise” and safer tracking rather than “faster” tracking. This means that while the Black may not work that much better than the Blue in authentic benchmarks, it’ll lead to better real-life performance, where it’ll track real data scattered on our disk, and not just random blocks of data fed by the benchmarking program. Plus, it’ll be much more stable and safer than the other drives, and will also wear down slower than the Blue or Green, keeping its performance for a longer period of time. That explains the 5-year warranty.

To further strengthen the point, let me tell you my own story. I myself use a 2TB Black drive (old FAEX version though), and it once died after around 2 and a half years of use. Based on a reliable technician’s diagnosis, it first got a problem in the PCB due to… complicated electrical problems (thunderstorm or crappy electricity net or… something), but then really died when it got ransacked by a faulty data recovery center. Thus, remembering that the Black drive has 5 years of warranty instead of 2, I came to WD’s warranty center for a replacement. My dad, who was very dim when it comes to technology, then asked if we could just take the 2TB Red drive on display as replacement, since it’s “also 2TB”. Before I could retaliate, the employee refused, saying that my Black drive was “far superior”, and added that even with the 5-year warranty, it’s “extremely rare” to see someone comes there with a Black drive, thus there wasn’t a replacement ready and I’d to wait a few days.

So, with that out of the way, my opinions on the Black, my personal favorite, are:


Technically has the fastest speed.

May have much better real-life performance than the Blue.

Much more stable and reliable.

Has a 5-year warranty.


Much more expensive than any other drive discussed here

Runs louder and a bit hotter than Blue or Green (minor annoyance, doesn’t mean it’s not as reliable as Blue or Green)


WD Red

Now this is where things get a little bit… advanced. Unlike the former 3 drives which were desktop drives and were meant for your PC, the WD Red is a NAS drive, meaning it was optimized for NAS systems.

So what is a NAS system, you ask? Well, NAS stands for Network-Attached Storage, and a NAS system is basically a hard drives system for a network. Think of it as the storage part of a mini-server for your office building, for example. With that being said, what’s so special about NAS drives? Well, they need to work as one, with perfect harmony.

Thus, the Red drives are equipped with NASware 3.0, which allows support for NAS systems of up to 8 bays, as well as 3D Active Balance Plus, which basically syncs the drives in a same system together to reduces overall vibrations and heat. The Red also has support for TLER, which is basically a time limit for the drive to fix its own errors, so that it forcefully stops before the NAS system recognizes the drive as dead, drops the drive out of the system and marks the system as degraded. This is generally a good thing for multi-drive interconnected systems, but not good for individual drives (usually used in personal systems), since the drives may not be done fixing errors before they are forced to stop

However, I must say that the Red is mostly marketing fluff though. Though it’s not as erroneous as Green, it’s also not known to be reliable. For real NAS devices you would have to look at Western Digital’s Enterprise-class drives (the Se, Re, and Ae series), which won’t be discussed here, or AT LEAST the Red Pro.

Hence, while the “business, professional” vibe of the Red may give the impression that it’s better than the Black, I have to frankly say that it’s not. Let’s look at a performance comparison, this time between the Red and the Blue (which is the default):

Oh my God… Just what’s the Red’s problem?

Another reason for this is: like I said, reliability. I’ve heard that the Black can actually be used in a NAS environment just as well as the Red, if not better. After all, although the Black is a “dirty desktop drive”, it’s still tuned for maximum performance and stability, with all kinds of safety measures installed, whereas the Red is merely advertised as “designed for 24/7 environment”.

WD Red Pro

The Red Pro is even more expensive than the Black, for a few reasons. It’s basically the Red, with better tracking technologies aside from 3D Active Balance Plus, such as the Black’s StableTrac and its own special “dual actuator technology”, and support for NAS systems with 8-16 bays. It’s also tested more thoroughly and comes with a 5-year warranty like the Black instead of 3. However, its maximum capacity is only 4 TB, whereas the normal Red series has 6 TB models.

Overall, here are my thoughts regarding the Red series:


Has TLER and other optimizations for NAS

Good vibrations control system to ensure the drives work well with one another

Has a 3-year warranty (5 for Red Pro)


Mediocre reliability (at least for regular Red)

Performance comparable to Green whereas the price is much higher


WD Purple

To be honest, I just don’t understand much about the WD Purple, but apparently it’s a “surveillance” HDD to be used with camera systems to store surveillance data. Like the Red, it’s yet another drive advertised for “24/7 operation”, comes with 3-year warranty, and it also supportsTLER.

However, its key feature is AllFrame, which… is supposed to optimize ATA streaming to give you better video streaming rate and less frame loss or something, I don’t quite understand (sorry, if anyone knows better in this department, please enlighten me on this. Thank you very much. >.<)  Apparently, it also has the Black’s Dynamic Cache system inside AllFrame, though tuned differently (write-intensive instead of balanced), and it has lower power consumption, not by cheap means like the Green, but with its own technology called IntelliSeek, which is supposed to find the seeking path that uses the least amount of power (basically the shortest seek path I think).

Anyway, let’s take a look at the performance comparison:

*Burst out laughing*

Well, that certainly explains why the Purple seems to be the least popular of the 5… It’s the 2nd most expensive drive, only after the Black, and yet it doesn’t seem to deliver where it counts. It also seems to have some reliability problems, too.

Like the Red Pro, the Purple also has a special edition called Purple NV, which is just a Purple that supports up to 64 cameras instead of 32 and has a stronger physical chassis to protect against natural substances like dust from outdoors. The Purple NV is meant to use for NVRs (Network Video Recorders) while the Purple is meant for DVRs (Digital Video Recorders)

Sadly, because I couldn’t quite understand this drive, I don’t feel like I can give a very fair “Pros and Cons” section for it. Thus, I think I’ll end the post here. Thank you for reading and supporting me so far! Which of the color drives is your favorite? Can you enlighten me more on those drives, especially on the Purple, since I’m still just a newbie? ^^ Again, thank you very much.


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