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Western Digital Caviar Green (WD30EZRX) 3 TB Desktop Hard Disk Drive Review
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Connectors & Jumpers

This is a Serial ATA hard drive, with native support for SATA 6.0 Gb/s. However, it is backward-compatible so you will have no problem using it with older SATA 3.0 Gb/s or SATA 1.5 Gb/s controllers.

The faster SATA 6.0 Gb/s interface is not really necessary for optimal performance since this WD Caviar Green 3 TB hard drive boasts a maximum sustained internal (platter-to-buffer) transfer rate of 123 MB/s. However, it can help improve performance by doubling the throughput between the drive's large 64 MB buffer and the SATA controller.

Like all Serial ATA drives, it comes the standard SATA data (left) and power (right) connectors and is hot-pluggable. That means you can connect and disconnect this hard disk drive to your PC while it's still running. To the left of the SATA connectors is the jumper block.

From what we can tell, Western Digital ships some drives with a jumper and others without a jumper. Since our OEM unit did not come with one, it is likely that only retail drives come with the jumper.

According to Western Digital, jumpering pins 1 and 2 enables Spread Spectrum Clocking (SSC). Placing the jumper across pins 5 and 6 will force the drive to use the slower SATA 1.5Gbits/s (OPT1) transfer speed. This is only necessary for certain SATA controllers that do not properly implement the SATA 3.0 Gb/s speed negotiation, like the VIA VT8237 and VT8237R south bridge chips.

Although other Western Digital hard disk drives with Advanced Format Technology have an Adv Format jumper option, this particular drive does not. There is a very simple reason - this drive does not support older operating systems like Windows XP or Windows 98 because they do not support the GUID Partition Table (GPT) which is necessary to access the full 3 TB capacity. Therefore, there is no need for the Adv Format jumper option.


Breather Holes

This WD Caviar Green 3 TB drive does not have any clearly-marked breather holes on the top plate.

The underside has two breather holes (see picture on the right) near the top of the drive. These holes must not be covered.

Breather holes allow condensation inside the hard drive to escape. They also equalize the hard drive's internal pressure with the ambient air pressure. The hard disk drive needs them to function properly, so please make sure you do not occlude the holes!


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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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