Western Digital 4 TB WD Red SATA III 5400 RPM 64 MB Cache Bulk/OEM NAS Hard Drive WD40EFRX

• Extensively tested for compatibility with top NAS manufacturers.
• Engineered for 24/7 operation and reliability.
• WD NASWare technology enables seamless integration with balanced performance.
• 3 year limited warranty.
• Package includes a hard drive only – no screws, cables, manuals included. Please purchase mounting hardware and cables separately if necessary.
  

  WD Red 4 TB NAS Hard Drive – The next generation of hard drives for home or small office network attached storage systems.

  

  Expanded solutions

  Our formula of success has led growth of WD Red into higher capacities and expansion into new 2.5-inch solutions. We now offer a broader, more comprehensive portfolio of NAS hard drives for our customers. It is not just about NAS drives, it is REDvolutionary.

  Next-generation experience

  Every component, line of code, and product decision was built on our passion and determination to deliver the best NAS experience. The next generation of WD Red hard drives delivers on this promise with massive capacity and NASware 2.0, which further improves drive reliability and protects your data in the event of a power loss or disruption.

   
  

  Product Features

  Exclusive NASware 2.0 technology – Our exclusive technology, NASware 2.0, makes WD Red thrive in the demanding small-NAS environment. By adding WD Red to your NAS system, not only is everything more efficient and reliable, you can better protect your data investment.

  3D Active Balance Plus – Our enhanced dual-plane balance control technology significantly improves the overall drive performance and reliability. Hard drives that are not properly balanced may cause excessive vibration and noise in a multi-drive system, reduce the hard drive life span, and degrade the performance over time. (EFRX models only)

  The right choice – WD Red is designed specifically for home and small office NAS systems and PCs with RAID.

  Enhanced reliability – Since your NAS system is always on, a highly reliable drive is essential. With a 35% MTBF improvement over standard drives, the WD Red drive with NASware 2.0 is designed for the 24×7 environment.

  NAS compatibility – Advanced firmware technology built into every WD Red drive, NASware 2.0 enables seamless integration, robust data protection and optimal performance for systems operating in NAS and RAID environments.

  

  The secret is the next-generation technology – WD’s next generation NASware 2.0 technology improves NAS storage performance by reducing common hard drive concerns in NAS systems including concerns for things like compatibility, integration, upgrade ability, reliability and cost of ownership that are experienced with a hard drive designed for desktop computers.

   

  Energy efficient and money saving – We keep power consumption low which keeps your NAS system happy and your wallet, too.

  Need help? We offer premium support – Every WD Red hard drive comes with our world-class professional support services including a premium dedicated 24/7 support line (available in English, other regional support hours vary).**

  ** Support outside of normal business hours is available in English only Go to http://support.wd.com for further details.

  The WD advantage – WD puts our products through extensive Functional Integrity Testing (F.I.T.) prior to any product launch. On average, each new product goes through 600,000 hours of testing. WD also has a detailed Knowledge Base with more than 1,000 helpful articles. You can also call toll-free support 7 days per week in the U.S. and Canada. See the WD Support site for full details.

  Upgrading your drive is easy – WD Acronis TrueImage, available as a free download on the WD Support site, enables you to copy all your data to a new drive so you don’t have to reinstall your operating system to get all the benefits of a new drive.

  

  WD-certified packaging – All WD drives purchased from Amazon.com are shipped in WD-certified hard drive packaging. It is designed and fully tested to provide WD products with the highest of safety while in transit. With WD-certified packaging, you can rest assured that your WD hard drive will arrive safely, fully protected, in a non-descript, easy-open package.

  Recommended use – WD Red NAS hard drives are recommended for use in home and small office 1-5 bay NAS systems. For systems that use more than 5 bays or are rack mount solutions, please consider WD datacenter hard drives.***

  ***WD hard drives are designed and tested for use in specific applications and environments. This ensures that your hard drive is compatible with and functions properly in your application. Our hard drives are warranted against defects in materials and workmanship in the system for which they were designed. Use in systems other than for what the hard drive was designed could result in compatibility problems that affect proper function, unrelated to material and/or workmanship defects. For best results, be sure to select the appropriate product for your application by consulting our product spec sheets on our website at www.wd.com or by calling our customer support line where we would be happy to help you through the selection process.

  Ideal for:

  • Small NAS environments 1 to 5 bay
  • RAID configurations
    WD Red ( WD40EFRX)

     

    Drive Specification Sheet (PDF)

    

    Product Specifications
    	Interface	SATA 6 Gb/s

    

    Performance Specifications
    	Rotational Speed	IntelliPower *
    	Buffer Size	64 MB

    Transfer Rates
    	Buffer To Host (Serial ATA)	6 Gb/s (Max)

    

    Physical Specifications
    	Formatted Capacity	4,000,787 MB
    	Capacity	4 TB
    	Form Factor	3.5 Inch
    	User Sectors Per Drive	7,814,037,168

    

    Performance Specifications
    Target Performance
    	MTBF	1,000,000 hours

    

    Physical Dimensions
    English
    	Height	1.028 Inches
    	Depth	5.787 Inches
    	Width	4.00 Inches
    	Weight	1.50 Pounds

    Metric
    	Height	26.1 mm
    	Depth	147 mm
    	Width	101.6 mm
    	Weight	0.68 kg

    

    Environmental Specifications
    Shock
    	Operating Shock (Read)	65G, 2 ms
    	Non-operating Shock	250G, 2 ms

    Acoustics
    	Idle Mode	25 dBA (average)
    	Seek Mode 0	28 dBA (average)

    Temperature (English)
    	Operating	32° F to 158° F
    	Non-operating	-40° F to 158° F

    Temperature (Metric)
    	Operating	-0° C to 70° C
    	Non-operating	-40° C to 70° C

    Humidity
    	Operating	5-95% RH non-condensing

    Vibration
    	Operating	0.004 g²/Hz (10 to 300 Hz)
    	Non-operating	0.05 g²/Hz (10 to 300 Hz)

    	Operating
    	Linear	20-300 Hz, 0.75G (0 to peak)

    

    Electrical Specifications
    Current Requirements
    	12 VDC
    	Read/Write	250 mA
    	Idle	230 mA
    	Standby	7 mA
    	Sleep	7 mA

    	5 VDC
    	Read/Write	280 mA
    	Idle	260 mA
    	Standby	105 mA
    	Sleep	105 mA

    	Power Dissipation
    	Read/Write	4.50 Watts
    	Idle	3.30 Watts
    	Standby	0.40 Watts
    	Sleep	0.40 Watts

    

    Compatibility
    Operating System
    	Compatibility	Windows/Mac/Linux

    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.