The advent of 6 TB HDDs, especially the helium filled 8 TB ones tells us that HDDs are here to stay no matter what – as their Cost per GB are still incomparable to any SSDs regardless of generation or type of NAND Flash used. Truth be told that not everyone could afford an SSD, and with capacity requirement still the king over performance, HDDs are undoubtedly here to stay for many years to come.

Now with wide selection of HDDs, it seems a bit confusing as to what capacity and performance bracket you require to finish the task at hand. Surely, HDDs are used to store and retrieve data, but there is more to it and picking the best possible mechanical drive should be a concern for everyone. A good analogy to explain this would be the the many type of tires available on most vehicles. If you are expecting a run on the track, then you should use a performance tire for the best possible grip. But if you’re expecting to go on a trip with a little bit of off-roading here and there, then you should be prepared to use an all terrain tire for the best possible outcome. On this small article, we will discuss the differences between WD’s color coded HDDs – mainly the Blue, Black, Red, Purple, and the Gold (unofficial) Data Center Drives. There are many, but they are not that hard to comprehend.

WD Blue HDD:

“Solid performance and reliability for everyday computing.” is the name of the game for the WD Blue HDDs. They are what you can call the “all season tires” of the WD HDD family due to their general performance, price, and reliability. The WD Blue boasts capacities ranging from 250 GB, 500 GB, 1 TB, and even 6 TB models with 5400 RPM for the higher capacity models and 7200 RPM for select entry to mid-range models.

WD HDD Colors (3)

These drives are recommended for general use, and provides great pricing per GB compared to other drives. This makes the Blue great for storing just about anything especially for desktop PCs where the balance between performance and pricing are important. Make no mistake though, as these drives could boast extra performance and reliability via basic consumer RAID 1 and RAID 0 configurations.

Model #InterfaceForm FactorRPM ClassCapacityCache
WD60EZRZSATA 6 Gb/s3.5 Inch54006 TB64 MB
WD50EZRZSATA 6 Gb/s3.5 Inch54005 TB64 MB
WD40EZRZSATA 6 Gb/s3.5 Inch54004 TB64 MB
WD30EZRZSATA 6 Gb/s3.5 Inch54003 TB64 MB
WD20EZRZSATA 6 Gb/s3.5 Inch54002 TB64 MB
WD10EZEXSATA 6 Gb/s3.5 Inch72001 TB64 MB
WD10EZRZSATA 6 Gb/s3.5 Inch54001 TB64 MB
WD7500AZEXSATA 6 Gb/s3.5 Inch7200750 GB64 MB
WD5000AZRZSATA 6 Gb/s3.5 Inch5400500 GB64 MB
WD5000AZLXSATA 6 Gb/s3.5 Inch7200500 GB32 MB
WD5000AAKXSATA 6 Gb/s3.5 Inch7200500 GB16 MB
WD3200AAKXSATA 6 Gb/s3.5 Inch7200320 GB16 MB
WD2500AAKXSATA 6 Gb/s3.5 Inch7200250 GB16 MB

WD Black HDD:

If you favor performance over better price per GB ratio, then the WD Black is the drive for you. This family of high performance HDDs are suitable for gamers, creatives, and enthusiasts. The drive starts at 1 TB of capacity, going all the way up to 5 TB and 6 TB models. These drives also features larger cache compared to the Blues with 64 – 128 MB cache.

WD HDD Colors (4)

Performance comes with responsibility, or should I say extra noise and warmer operation. This could be easily remedied with a capable enclosure with good enough airflow, and sound dampening. Suffice to say those are expected to be provided by the power users. Ultimately, the WD Black family features 5 years of warranty.

Model #InterfaceForm FactorRPM ClassCapacityCache
WD6001FZWXSATA 6 Gb/s3.5 Inch72006 TB128 MB
WD5001FZWXSATA 6 Gb/s3.5 Inch72005 TB128 MB
WD4003FZEXSATA 6 Gb/s3.5 Inch72004 TB64 MB
WD3003FZEXSATA 6 Gb/s3.5 Inch72003 TB64 MB
WD2003FZEXSATA 6 Gb/s3.5 Inch72002 TB64 MB
WD1003FZEXSATA 6 Gb/s3.5 Inch72001 TB64 MB
WD5003AZEXSATA 6 Gb/s3.5 Inch7200500 GB64 MB
WD4001FAEXSATA 6 Gb/s3.5 Inch72004 TB64 MB
WD3001FAEXSATA 6 Gb/s3.5 Inch72003 TB64 MB
WD2002FAEXSATA 6 Gb/s3.5 Inch72002 TB64 MB
WD1002FAEXSATA 6 Gb/s3.5 Inch72001 TB64 MB

WD Red and Red PRO:

The WD Red is built specifically for one purpose and one purpose alone – and that’s all about slotting it inside a NAS or Network Assisted Storage. This drive is fully compatible with the majority of NAS systems or bay systems out there. Something that the other WD drives only wished they could provide. Since NAS is also about capacity, the WD Red family features a minimum of 750 GB capacity model, with good increments up to the 8 TB version. Basic and intermediate RAID configuration is also supported, with 24/7 reliability under NAS conditions.

WD HDD Colors (5)

Now bear in mind that the Red family excels more into the read performance, rather than balancing things out for both read and write. This is to ensure that it will feature optimal NAS capabilities. After all, you store data, movies, images or anything you could think of into it, and have it conveniently accessed on the network where multiple systems might require to access the NAS at the same time.

WD Red ModelInterfaceForm FactorRPM ClassCapacityCache
WD80EFZXSATA 6 Gb/s3.5 Inch54008 TB128 MB
WD60EFRXSATA 6 Gb/s3.5 Inch54006 TB64 MB
WD50EFRXSATA 6 Gb/s3.5 Inch54005 TB64 MB
WD40EFRXSATA 6 Gb/s3.5 Inch54004 TB64 MB
WD30EFRXSATA 6 Gb/s3.5 Inch54003 TB64 MB
WD20EFRXSATA 6 Gb/s3.5 Inch54002 TB64 MB
WD10EFRXSATA 6 Gb/s3.5 Inch54001 TB64 MB
WD10JFCXSATA 6 Gb/s2.5 Inch54001 TB16 MB
WD7500BFCXSATA 6 Gb/s2.5 Inch5400750 GB16 MB


WD Red PRO ModelInterfaceForm FactorRPM ClassCapacityCache
WD6002FFWXSATA 6 Gb/s3.5 Inch72006 TB128 MB
WD6001FFWXSATA 6 Gb/s3.5 Inch72006 TB128 MB
WD5001FFWXSATA 6 Gb/s3.5 Inch72005 TB128 MB
WD4002FFWXSATA 6 Gb/s3.5 Inch72004 TB128 MB
WD4001FFSXSATA 6 Gb/s3.5 Inch72004 TB64 MB
WD3001FFSXSATA 6 Gb/s3.5 Inch72003 TB64 MB
WD2001FFSXSATA 6 Gb/s3.5 Inch72002 TB64 MB

WD Purple and Purple NV:

The WD Purple family is built specifically to take the job of a surveillance catered drive. Meaning, it should withstand the test of time by operating 24/7 round the clock, able to withstand the surveillance environment which is totally not ideal for any drives depending on location, and basically, write and write and write data most of the time.

WD HDD Colors (6)

If the Red is all about read, then the Purple is all about the write. Thus, WD made sure that errors in saving the recording videos or footages are minimized with their AllFrame technology. Basically, it minimizes the frames lost – which is beneficial in situations where frame by frame analysis is important. The WD Purple family is available in wide configurations starting from 500 GB up to 8 TB of capacity with a maximum of 32 cameras per drive. The Purple NV, which supports more than 32 cameras, has a limited capacity range from 4 to 6 TB but supports larger bay configurations. Both the WD Purple and Purple NV features a 3 year warranty. Price is of course higher than your general drive.

WD Purple ModelInterfaceForm FactorRPM ClassCapacityCache
WD80PUZXSATA 6 Gb/s3.5 Inch54008 TB128 MB
WD60PURXSATA 6 Gb/s3.5 InchIntelliPower6 TB64 MB
WD50PURXSATA 6 Gb/s3.5 InchIntelliPower5 TB64 MB
WD40PURXSATA 6 Gb/s3.5 InchIntelliPower4 TB64 MB
WD30PURXSATA 6 Gb/s3.5 InchIntelliPower3 TB64 MB
WD20PURXSATA 6 Gb/s3.5 InchIntelliPower2 TB64 MB
WD10PURXSATA 6 Gb/s3.5 InchIntelliPower1 TB64 MB
WD05PURXSATA 6 Gb/s3.5 InchIntelliPower500 GB64 MB


WD Purple NV ModelInterfaceForm FactorRPM ClassCapacityCache
WD6NPURXSATA 6 Gb/s3.5 InchIntelliPower6 TB64 MB
WD4NPURXSATA 6 Gb/s3.5 InchIntelliPower4 TB64 MB

WD DataCenter Re Se and Ae:

The WD Datacenter HDD family are, simply put the drives that caters for the enterprise solutions. These drives are available in 3 sub families with the WD Re being the fastest, while the WD Se goes for the middle ground between performance, and cost effectiveness in the series. The WD Ae however, are optimized for cold storage – meaning that those drives are specifically for archiving purposes. While it’s not officially stated by WD, Gold should be the denominating color of these Datacenter drives.

WD HDD Colors (1)

Make no mistake though, as these drives features the most sophisticated WD features. For example, the WD Re could handle 550 TB per year of data, with 2 million hours MTBF (Mean Time Between Failures). The drive also features StableTrac™ technology, Multi-axis shock sensor, and Dynamic fly height technology for the read and write head. Basically, these drives features the most advanced WD technologies to date.

Model #InterfaceForm FactorRPM ClassCapacityCache
WD6002FRYZSATA 6 Gb/s3.5 Inch72006 TB128 MB
WD6001FXYZSATA 6 Gb/s3.5 Inch72006 TB128 MB
WD5001FXYZSATA 6 Gb/s3.5 Inch72005 TB128 MB
WD6001FSYZSATA 6 Gb/s3.5 Inch72006 TB128 MB
WD5001FSYZSATA 6 Gb/s3.5 Inch72005 TB128 MB
WD4002FYYZSATA 6 Gb/s3.5 Inch72004 TB128 MB
WD2004FBYZSATA 6 Gb/s3.5 Inch72002 TB128 MB
WD1004FBYZSATA 6 Gb/s3.5 Inch72001 TB128 MB
WD4000FYYZSATA 6 Gb/s3.5 Inch72004 TB64 MB
WD3000FYYZSATA 6 Gb/s3.5 Inch72003 TB64 MB
WD200MFYYZSATA 6 Gb/s3.5 Inch72002 TB64 MB
WD1003FBYZSATA 6 Gb/s3.5 Inch72001 TB64 MB
WD5003ABYZSATA 6 Gb/s3.5 Inch7200500 GB64 MB
WD2503ABYZSATA 6 Gb/s3.5 Inch7200250 GB64 MB
WD4001FYYGSAS 6 Gb/s3.5 Inch72004 TB32 MB
WD3001FYYGSAS 6 Gb/s3.5 Inch72003 TB32 MB
WD2001FYYGSAS 6 Gb/s3.5 Inch72002 TB32 MB
WD1001FYYGSAS 6 Gb/s3.5 Inch72001 TB32 MB

Other WD Drives:

WD also offers drives specifically for A/V streamers, along with a few SSHDs and the 10, 000 RPM WD VelociRaptors. They are not marketed, or exposed equally like the other families of WD HDDs, but it doesn’t mean that they are inferior to the main drives at the spotlight since they are purpose built like the said drives as well. For example, the WD SSHD which is in fact a sub family of the WD Blues, are suitable for notebooks with a single drive bay – meeting the performance and capacity requirements of such devices.

WD HDD Colors (7)

Now if you’re wondering why we decided to exclude the WD Green, it is worth noting that these family of drives has been absorbed by the WD Blue family. By doing so, WD could streamline their portfolio and simplify the process of drive selection by their consumers. Power efficiency margins are getting thinner and thinner through the years too if we’re to compare the WD Green and the WD Blue’s power efficiency.

Final Thoughts:

Performance, Capacity, Reliability, and Purpose defines what storage drives you really need to get the job done – and WD got you covered  with anything that you require – be it for gaming, network assisted storage, surveillance, and even data center applications. All under one banner with easy to differentiate purposes via color coding.


TL;DR – Blues are for general purpose storage, Blacks are for gaming, content creation, and enthusiasts, Reds are for NAS, Purple is for surveillance, and Gold (unofficial) are for industry movers with data center applications in mind. Each and everyone of them fits a key to a slightly different door, and picking the best one is always better than using a lock pick at all. To learn more about the WD HDDs, visit this link for more details.