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Western Digital Caviar Green (WD30EZRX) 3 TB Desktop Hard Disk Drive Review
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The Improved 3 TB WD Caviar Green

The Western Digital WD30EZRX hard disk drive improves on the original 3 TB Caviar Green (WD30EZRSDTL) hard disk drive by adding a new SATA 6 Gpbs interface. It also boasts a slightly higher spindle speed - about 11% faster according to our own tests. However, we understand that newer WD30EZRSDTL drives also feature the slightly higher spindle speed.

Physically, the new 3 TB Caviar Green with Advanced Format Technology and 6 Gbps interface looks like any other 3.5" desktop hard drive, with a label on the top plate and an uncovered PCB on the underside. The label has a lot of important information, like the hard drive model and capacity. There are also interesting details like its date and place of manufacture. This particular drive was manufactured in Thailand on 29 March, 2011.

Do note that while this is an Advanced Format drive, there is no warning about using WD Align with older operating systems like Windows XP. This is because this drive does not "support" older operating systems like Windows XP. You can use this drive in Windows XP or even Windows 98, but you will be limited to the first 2.1 TB.


Usable Capacity

This Western Digital Caviar Green 3 TB hard disk drive officially has a formatted capacity of 3,000,592 MB. We checked that out by formatting it in NTFS using Windows Vista.

The actual formatted capacity was 3,000,457,224,192 bytes. This is slightly (457 MB) above than the official formatted capacity. With about 140 MB allocated to the NTFS file system, the actual usable capacity remained slightly above 3 TB.

Let's take a look at its specifications.





Formatted Capacity

• 3,000,592 MB

Guaranteed Sectors

• 5,860,533,168

Bytes Per Sector

• 512 bytes (Emulated)


• 4 Platters

Read/Write Heads

• 8 Read/Write Heads

Spindle Speed

• Fixed, Between 5400-7200 RPM

Cache Buffer


Internal Data Transfer Rate

• 123 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

• 730 g (1.61 lbs)

Power Requirements

• +12V DC ± 10 %
• +5V DC ± 5 %

Power Consumption

• 6.0 W (Read / Write)
• 5.5 W (Idle)
• 0.8 W (Standby)
• 0.8 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)


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Western Digital WD30EZRX Overview


Introduction, Packaging


The Improved 3 TB WD Caviar Green
Usable Capacity, Specifications


Connectors & Jumpers, Breather Holes


Testing The Improved 3 TB Caviar Green


Maximum Surface Temperature
Platter Transfer Rate Profile


WinBench 99 Test Results
Transfer Rate Range


IO Meter Random Access Performance


IO Meter Sequential Access Performance


IOPS Scaling (Random Access)


IOPS Scaling (Sequential Access)



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