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Western Digital Caviar Green (WD20EARX) 2 TB Hard Disk Drive Review
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Western Digital Caviar Green (WD20EARX) 2 TB Desktop Hard Disk Drive (6 Gbps)

Western Digital divides their internal hard drives into three distinct families - the WD Caviar Blue for their basic hard drives, the WD Caviar Green for their quieter, cooler hard drives and the WD Caviar Black for their performance-grade hard drives.

According to Western Digital, Caviar Green hard disk drives offer an average power saving of 4-5 watts over their competitors, a feat that they claim is equivalent to reducing CO2 emissions by 13.8 kg per year. Of course, that's a mere drop in the ocean but if you can help save the environment while you work or play on your computer, why not?

Today, we will look at the improved Western Digital Caviar Green 2 TB hard disk drive - the new Western Digital WD20EARX with Advanced Format Technology and SATA 6 Gbps interface. Let's find out how well this drive performs!

For more details, read our Comprehensive Review!

To discuss about this review, head over to the forum thread!

Lowest PriceGrabber Price


Comprehensive Review



Formatted Capacity

• 2,000,398 MB

Guaranteed Sectors

• 3,907,029,168

Bytes Per Sector

• 512 bytes (Emulated)


• 3 Platters

Read/Write Heads

• 6 Read/Write Heads

Spindle Speed

• Fixed, Between 5400-7200 RPM

Cache Buffer


Internal Data Transfer Rate

• 110 MB/s (sustained, maximum)

Maximum I/O Transfer Rate

• 6.0 Gbits/s

Average Seek

• 8.9 ms

Average Latency

• NA

Drive Ready Time

• 14.3 seconds


• Serial ATA 6 Gb/s

Supported SATA Data Transfer Mode

• 6.0 Gbits/s
• 3.0 Gbits/s
• 1.5 Gbits/s

SATA Hotplug Capability

• Yes

Maximum Height

• 26.1 mm (1.028 inches)

Maximum Width

• 101.6 mm (4.00 inches)

Maximum Length

• 147.0 mm (5.787 inches)

Maximum Weight

• 640 g (1.40 lbs)

Power Requirements

• +12V DC ± 10 %
• +5V DC ± 5 %

Power Consumption

• 5.3 W (Read / Write)
• 3.3 W (Idle)
• 0.7 W (Standby)
• 0.7 W (Sleep)

Ambient Temperature

• 0 °C to 60 °C (Operating)
• -40 °C to 70 °C (Non-Operating)

Maximum Shock

• 65 G @ 2 ms (Read/Write)
• 250 G @ 2 ms (Non-Operating)

Drive Acoustics

• 24 dBA average (Idle Mode)
• 29 dBA average (Performance Seek Mode)
• 25 dBA average (Quiet Seek Mode)

Non-Recoverable Read Errors

• 1 error per 1014 bits read

Load/Unload Cycles

• 300,000 (minimum)


• 3 Years Limited Warranty (OEM or Retail)


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Tech ARP is committed to developing new ways to improve your experience with us. As part of our continuous efforts to improve the value of our reviews to you, we are implementing a multi-tier review system.

This review system is designed to allow you to quickly receive information on the latest hardware or software. This new system also allows you to quickly get the gist of the review without reading through it. This can be very useful, especially in situations where you need to make a quick purchase decision.

In this new system, we start with a Product Overview whenever a company sends us a press release about their latest product. We shift through extraneous PR-talk to create a straightforward summary of the product's features as well as specifications. This allows you to quickly find out all the pertinent details about the product, without reading through official press releases.

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After thorough testing, we will post a Comprehensive Review of the product. This adds on to the pictorial review with comprehensive test results and our final conclusion on the product.

But no matter whether you are reading a Pictorial Review or a Comprehensive Review, you can always read the summary of the review as well as examine the product's specifications right on the first page. In all our new reviews, we will maintain the first page as a Product Overview page. If the product is listed in PriceGrabber, you can also check out the lowest price online.

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