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WD Se Datacenter 3.5-inch Hard Drives
High-Performance, High-Capacity Storage for Mid-Intensity Applications

WD Se Datacenter 3.5-inch Hard Drive

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WD Se datacenter capacity storage is an ideal solution for scale-out datacenters, delivering a cost-effective combination of performance, capacity, and workload capability, while maintaining the hardiness of a true enterprise-class design. WD Se is best suited for bulk cloud storage, distributed file systems, replicated environments, cost-efficient RAID architectures and content delivery networks (CDNs).

Cost effective enterprise-class storage.

Cost effective enterprise-class storage.
Get the right blend of performance, workload capability and capacity and keep your total cost of ownership low.

24x7x365 reliability.

24x7x365 reliability.
Choose the storage foundation specifically designed for large-scale datacenter replication environments running 24x7x365.

High capacity for hyperscale environments.

High capacity for hyperscale environments.
Build a massive data footprint with capacities up to 6 TB - 216 TB per square foot.

WD SeDesigned for quality and reliability.
Datacenter drives undergo at least 5 million hours of functional testing, and over 20 million hours of comprehensive interoperability testing in an extensive array of server and storage systems.

Dual actuator technology.
A head positioning system with two actuators that improves positional accuracy over the data track(s). The primary actuator provides coarse displacement using conventional electromagnetic actuator principles. The secondary actuator uses piezoelectric motion to fine tune the head positioning to a higher degree of accuracy.

Vibration Protection
Enhanced RAFF technology includes sophisticated electronics to monitor the drive and correct both linear and rotational vibration in real time. The result is a significant performance improvement in high vibration environments over the previous generation of drives.

NoTouch ramp load technology.
The recording head never touches the disk media ensuring significantly less wear to the recording head and media as well as better drive protection in transit.

Dual processor.
Twice the processing power to maximize performance.

The motor shaft is secured at both ends to reduce system-induced vibration and stabilize platters for accurate tracking during read and write operations. (2 TB and above)

Multi-axis shock sensor.
Automatically detects the subtlest shock events and compensates to protect the data.

RAID-specific, time-limited error recovery (TLER).
Prevents drive fallout caused by the extended hard drive error-recovery processes common to desktop drives.

Thermal extended burn-in test.
Each drive is put through extended burn-in testing with thermal cycling to ensure reliable operation.

Dynamic fly height technology.
Each read-write head's fly height is adjusted in real time for optimum reliability.

Environmentally responsible.
In addition to being RoHS compliant, these drives are built with halogen reduced components.

Ideal for:
The Se is best suited for bulk cloud storage, replicated environments, content delivery networks (CDNs), SMB network attached storage (NAS), backup and archiving.


Ideal for bulk cloud storage, distributed file systems, replicated environments, cost-efficient RAID architectures, and content delivery networks (CDNs).

The WD Advantage

WD puts our datacenter products through extensive Functional Integrity Testing (F.I.T) prior to any product launch. This testing ensures our products consistently meet the high quality and reliability standards of the WD brand. Following a FIT test the Enterprise System Group (ESG) testing validates interoperability with HBAs, operating systems and drivers to ensure an even greater level of quality, reliability and peace of mind.

WD also has a detailed Knowledge Base with helpful articles and software utilities. Our customer support lines have longer operational hours to ensure you get the help you need when you need it. Our toll-free customer support lines are here to help or you can access our WD Support site for additional details.


Examples of the number of photos, songs, videos and any other files that can be stored on a hard drive are provided for illustrative purposes only. Your results will vary based on file size and format, settings, features, software and other factors.

Photo: Figures represent the average number of photos taken with a 6 megapixel camera in high-resolution JPEG mode with an average file size of 3.5 MB per photo. The actual number of images will vary by camera model and compression setting.

Hours: The DV format, regardless of its mode (miniDV, DVCAM, DVC-Pro) has a data rate of approximately 25mb/s (mega-bits per second). In storage terms, this translates to approximately 3.5MB/s (Megabytes per second) or 13GB/hr (Gigabytes per hour)

Song: Music capacity is based on 4 minutes per song. MP3 capacity is based on 128 Kbps bit rate and 11:1 audio compression ratio. Uncompressed CD quality is based on 1:1 audio compression ratio.

WD Se Dimensions

What It Holds

As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes, and one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. As used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or interface, megabyte per second (MB/s) = one million bytes per second, megabit per second (Mb/s) = one million bits per second, and gigabit per second (Gb/s) = one billion bits per second.

Drive Size 6 TB 5 TB 4 TB 3 TB 2 TB 1 TB
Model Number1 WD6001F9YZ WD5001F9YZ WD4000F9YZ WD3000F9YZ WD2000F9YZ WD1002F9YZ
Interface SATA 6 Gb/s SATA 6 Gb/s SATA 6 Gb/s SATA 6 Gb/s SATA 6 Gb/s SATA 6 Gb/s
Formatted Capacity2 6 TB 5 TB 4 TB 3 TB 2 TB 1 TB
User sectors per drive 11,721,045,168 9,767,541,168 7,814,037,168 5,860,533,168 3,907,029,168 1,953,525,168
Form factor 3.5-inch 3.5-inch 3.5-inch 3.5-inch 3.5-inch 3.5-inch
Advanced Format (AF) Yes Yes Yes Yes Yes Yes
Native command queuing Yes Yes Yes Yes Yes Yes
RoHS Compliant3 Yes Yes Yes Yes Yes Yes
Data transfer rate (max)
Buffer to host
host to/from drive (sustained)

6 Gb/s
214 MB/s

6 Gb/s
214 MB/s

6 Gb/s
171 MB/s

6 Gb/s
168 MB/s

6 Gb/s
164 MB/s

6 Gb/s
187 MB/s
Cache (MB) 128 128 64 64 64 128
Rotational Speed (RPM) 7200 7200 7200 7200 7200 7200
Reliability/Data Integrity
Load/unload cycles4 300,000
Non-recoverable read errors per bits read <1 in 1015
MTBF (hours)5 1,000,000 1,000,000 1,000,000 1,000,000 1,000,000 800,000
MTBF (hours) for 1-5 bay NAS6 1,200,000 1,200,000 1,200,000 1,200,000 1,200,000 1,000,000
Limited warranty (years)7 5 5 5 5 5 5
Power Management
Average power requirements (W)
Sequential read:
Sequential write:
Random read/write:






Environmental Specifications8
Operating Temperature 0 to 55° C
Non-operating Temperature -40 to 70° C
Shock (Gs)
Operating (2 ms, read/write) 30 30 30 30 30 30
Operating (2 ms, read) 65 65 65 65 65 65
Non-operating (1 ms) 300 300 300 300 300 300
Average acoustics (dBA)9
Idle mode 31 31 31 31 31 30
Performance seek mode 34 34 34 34 34 34
Physical Dimensions
Height (in./mm, max) 1.028/26.1
Length (in./mm, max) 5.787/147
Width (in./mm, ± .01 in.) 4/101.6
Weight (lb./kg, ± 10%) 1.58/0.72 1.58/0.72 1.66/0.75 1.66/0.75 1.55/0.70 0.99/0.45

1 Not all products may be available in all regions of the world.
2 As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes, and one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. As used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or interface, megabyte per second (MB/s) = one million bytes per second, and gigabit per second (Gb/s) = one billion bits per second. Effective maximum SATA 3 Gb/s transfer rate calculated according to the Serial ATA specification published by the SATA-IO organization as of the date of this specification sheet. Visit www.sata-io.org for details.
3 WD hard drive products manufactured and sold worldwide after June 8, 2011, meet or exceed Restriction of Hazardous Substances (RoHS) compliance requirements as mandated by the RoHS Directive 2011/65/EU.
4 Controlled unload at ambient condition.
5 Product MTBF and AFR specifications are based upon a 40°C base casting and system workloads of up to 180 TB/year (workload is defined as the amount of user data transferred to or from the hard drive).
6 Based on a typical 1-5 bay tabletop NAS product environment under normal operating conditions.
7 The term of the limited warranty may vary by region. Visit http://support.wd.com/warranty for details.
8 No non-recoverable errors during operating tests or after non-operating tests.
9 Sound power level.

WD Datacenter Storage Portfolio:

Elemental storage building blocks for every datacenter

WD's datacenter hard drives are built to run in always-on environments where they are required to maintain maximum performance and data integrity within complex systems running massive scale applications.

In addition to overall performance and reliability, these drives feature additional attributes that are unique to enterprise-class hard drives for datacenter deployments:

  • Cleanliness
  • Error Rate
  • Drive to Drive Variation Linear and Radial Vibration
  • Performance Degradation
  • Number of Mapped Defects, Defects per Surface
  • Head Amplitude, Track Width
  • Tracks per Disk
  • Robust Factory Process and Procedures

From multiple processors and redundant power supplies to specialized storage devices and robust interfaces such as SAS, datacenters demand the highest quality and most reliable components to ensure maximum uptime, expandability, and data integrity.

Through fundamental enterprise-class design, specialized features and technologies and rigorous manufacturing and test processes, WD delivers the right storage building blocks for every datacenter.


Designed to deliver optimal durability in your datacenter.

WD ReWith the industry's highest capacity, class-leading reliability and ten times the workload capability of desktop drives, WD Re is the workhorse of the WD's datacenter portfolio. WD Re is perfect for high-availability storage arrays such as RAID, that demand the most robust storage device available. WD Re's high performance, capacity and reliability make it ideal for data warehousing/mining and high-performance computing. WD Re is available with either a SAS or SATA interface for flexibility and maximum compatibility. The drive's SAS interface contributes to its high reliability and manageability in high-availability arrays.

WD Re Purchase Decision Criteria
  • Designed for RAID configurations
  • Highest error tolerance of any capacity-optimized drive
  • Industry-leading combination of capacity, reliability and workload capability

Best for:

On-line analytical processing (OLAP), high-performance computing, high-reliability cloud storage, high-availability RAID arrays.

If your application requires capacity without compromising reliability and workload capability, WD Re is the right datacenter storage device for you.


Designed to deliver optimal scalability in your datacenter.

WD SeWith the ideal combination of capacity, reliability and workload capability for many scale-out architectures, WD Se provides acost-effective solution for large-scale cloud deployments and entry to mid-range arrays designed for low workload applications. With its true enterprise-class pedigree and design, WD Se is ideal for multi-bay enclosures, from entry level servers, to mid-range Network-Attached Storage (NAS), to bulk cloud storage. WD Se employs Advanced Format and the SATA interface to deliver the lowest cost per gigabyte of any enterprise-class drive in the portfolio. This enables WD Se to deliver flexibility and value in all medium-workload applications.

WD Se Purchase Decision Criteria
  • Optimized for replicated and NAS environments
  • Feature-set enhanced to enable lower cost per gigabyte
  • Enterprise-class design delivers capacities up to 4 TB

Best for:

Bulk cloud storage, social networking, NAS, Big Data, replication-based distributed file systems, backup and archiving.

If your application deployment requires enterprise-class features and can withstand lower performance and reliability to gain a more cost-effective solution, WD Se is the right datacenter storage device for you.

WD Datacenter HDD Technology

Datacenters are building out at an incredible rate to keep up with the tremendous growth of data. A 42U storage rack may include over 900 drives, providing almost 3 PB of storage. A system that contains many drives needs to be specially designed with features and technologies that ensure reliability, scalability, high availability and deliver consistent levels of performance. However, some of these features and technologies create challenges for hard drives – environmental, compatibility and workload challenges.

Here is a deeper look at these challenges and a explanation of how hard drives need to be designed for enterprise-class datacenter and cloud storage environments. Needless to say, datacenters present challenging environments for hard disk drives, and therefore require a fundamentally different class of drive – an enterprise-class drive.

Challenge #1: Environment

The datacenter environment employs specialized server and storage systems containing high-speed fans, densely-packed drives and temperature fluctuations.

IT Concerns:

  • High-speed fans are necessary to manage thermals but generate a wide range of vibrations
  • Densely-packed drives induce vibration on each other, potentially causing system-level performance degradation
  • Redundant power supplies reflect the multiple fail-over technologies that ensure 24/7 operation
  • Datacenter geographical location and cooling solutions vary, creating temperature and altitude extremes

WD's solution: A storage portfolio built to withstand harsh datacenter conditions.

  • RAFF + tied shaft motors are designed to compensate for multi-drive enclosures while ensuring consistent levels of performance
  • Higher quality components - designed for 24/7/365 operation (8,760 power-on hours per year)
  • High reliability with class-leading 5-year enterprise-grade warranty
  • Support for a wide range of temperature and altitude ratings

Challenge #2 Compatibility

Datacenters require different host bus adapters and fault-tolerance schemes like RAID and replication to ensure maximum performance, manageability and availability of a large amount of storage space.

IT Concerns:

  • RAID-based arrays demand high performance, tight performance variation, high error tolerance, and multiple interface options
  • Replication-based systems deliver high levels of data availability vs. traditional RAID and can tolerate lower reliability and lower performing devices
  • IT managers require interoperability across a wide range of host bus adapters that are deployed within their datacenters

WD's solution: Storage devices that work flawlessly with hundreds of different controllers in both RAID and replication arrays.

  • Higher error tolerances, tight performance variation, and SAS and SATA options for RAID systems
  • Datacenter quality products with right-sized error rates and performance that are optimized for replicated systems
  • Broad HBA compatibility including functional and signal-integrity testing also tuned and optimized for system interoperability

RAID-based array and Replication array

Challenge #3 Workload

Datacenter and cloud storage systems use a wide variety of operating systems and applications that need to work flawlessly with their chosen device. Workloads are typically ten times greater than the workload of desktop or notebook computers and the storage devices must be able to handle workload-intensive applications 24 hours a day, 365 days a year.

IT Concerns:

  • Applications have varying workloads – heavy reads or writes, sequential or random performance, low latency
  • Some datacenter applications require 100% workload, 24 hours per day, 365 days per year
  • OEMs are typically not aware of the types of workloads being employed on systems they sell

WD's solution: Storage devices that work flawlessly with hundreds of different controllers in both RAID and replication arrays.

  • Higher RPM models for performance demanding applications
  • Products are designed for 8,760 power-on hours per year, reading and writing continuously
  • Massive testing – actual systems, actual workloads
  • Specialized manufacturing and test processes

Advanced Format TechnologyAdvanced Format Hard Drive Download Utility:

About Western Digital Advanced Format Hard Drives

WD Advanced Format drives are specifically optimized for Mac and the latest Windows operating systems such as Windows Vista and Windows 7 with a clean install. Advanced Format Technology is being adopted by WD and other drive manufacturers to increase media format efficiency, thus enabling larger drive capacities.

Using your WD Advanced Format Hard Drive with a Windows Operating System may require you to run the WD Align Windows software utility after you install your operating system or partition and format the drive as a secondary drive. The WD Align software aligns existing partitions on the Advanced Format drive to ensure it provides full performance for certain configurations. (Please see table for configuration details)

If your operating system is either Windows 7 or Vista, WD recommends using the latest Intel driver version 9.6 or later for maximum performance in all situations. Please visit Intel for the latest driver downloads.

OS used to create patition Clean Install Cloning utilitiy
1 Partition or > 1 Partition
1 Partition
> 1 Partition
Windows XP Run WD Allgn Run WD Allgn Run WD Allgn Run WD Allgn
Windows Vista N/A Run WD Allgn N/A N/A
Windows 7 N/A Run WD Allgn N/A N/A
Mac OS N/A N/A N/A N/A

What does Advanced Formatting mean to me?

Advanced formatting optimizes hard drives to take advantage of the capabilities of newer operating systems. This capability enables hard disk drive manufacturers the ability to design larger capacity hard drives, now and into the future.

What are the benefits of Advanced Formatting?

Advanced Formatting enables hard drive companies to read and write more data into the same available space on the hard drive.

Can I install an Advanced Format hard drive in my system?

New drives from WD are optimized for operation with Windows 7, Windows Vista and Mac OS X Tiger, Leopard, Snow Leopard. If you are attempting a clean install of an Advanced Format hard drive into a system running one of the Operating Systems listed above the installation process follows standard procedure. For older operating systems such as Windows XP, and for users using cloning software, users must run the WD Align utility to achieve the full performance of the drive. (See table for configuration details)

Early 3.5-inch WD drives with Advanced Format supported jumper pins 7 – 8. Placing a jumper on these pins adjusted the drive's internal alignment for single partition XP installations. Support for this jumper setting is no longer needed on newer drives. For optimal performance on all XP installations WD recommends running the WD Align utility.

If you have a drive that supports jumper pins 7 – 8 and have a jumper in place on those pins, the following is additional information to assist you if you are re-installing an Operating System or re-partitioning the drive:

  • IMPORTANT: You must backup your drive before making any changes, including removal of the jumper.
  • Re-partition the drive: Turn off power to the drive and remove the jumper from pins 7 – 8. Power-on and re-partition the drive (NOTE: All previous data on the drive will be lost).
  • Preserve Current Partition: If you are installing an Operating System over the existing partition, keep the jumper on pins 7 – 8. The drive is already aligned to the existing partition so you do not need to remove the jumper.
  • If you change the setting of jumper 7 – 8, you will lose all previous data and the drive must be re-partitioned.

For a clean install of Windows XP using multiple partitions, DO NOT install the jumper; simply run the WD Align utility.

Can I install a WD Advanced Format Drive under non-Windows Operating Systems, such as MacOS and Linux?

WD Advanced Format Drives can be used under non-Windows Operating Systems.

Do I need a special driver to install a WD Advanced Format Drive on an Intel chipset?

If your operating system is either Windows 7 or Vista, we recommend the following for maximum performance in all situations:

  • For Intel chipset, use the latest Intel driver version 9.6 or later. Please visit Intel for the latest driver downloads at http://www.intel.com/support/chipsets/imsm/sb/CS-031502.htm
  • For AMD chipset, no driver update is required.
  • For Nvidia chipset, please visit http://support.microsoft.com/kb/982018 for additional information.

What is WD Align utility software?

The WD Align utility enables older operating systems to operate at full performance on Advanced Format hard drives.

How long will running the WD Align utility take?

It will vary based on your operating system and how much data is on the disk, but the WD Align utility should take about 20 minutes to complete on freshly installed drive images with no data files. We recommend disabling Power Management prior to starting the partitioning alignment process.

Does the WD Align utility have to be run again if a drive is reformatted?

No, users will only need to run WD Align one time after initially installing Windows XP. Once Windows XP has been aligned, it will stay aligned even if the drive is reformatted or many files are added or removed.

What models utilize Advanced Format technology?

Some models of the WD Green and WD Blue product families are built using Advanced Format technology. Over time more models and capacities will be added. WD drives with Advanced Format technology include special installation information on the drive label so be sure to read the label on your drive before installing it.

Does WD Align work with Western Digital USB and Firewire drives, such as My Book and My Passport drives?

If you do not change the partitions on a Western Digital USB or Firewire drive, the drive is already optimally aligned. However, all Western Digital USB and Firewire drives are specifically designed to work with WD Align. If you repartition a Western Digital USB or Firewire drive, WD Align should be run to optimally align the partition or partitions.

Can I install my Advanced Format Drive into a USB enclosure?

Yes, you may install your Advanced Format Drive into a USB enclosure.

Drive Views:

Bottom View
Bottom View
Top Angle View
Top Angle View

Right Angle View
Right Angle View
Cover View
Cover View


Download the WD Se Specsheet (PDF).