Buy the ARP T-Shirt! BIOS Optimization Guide Money Savers!

 07 October 2011
 Dr. Adrian Wong
 Discuss here !
Desktop Graphics Card Comparison Guide Rev. 33.0
Covering 628 desktop graphics cards, this comprehensive comparison allows you ... Read here
BIOS Option Of The Week - Virtualization Technology
Since 1999, we have been developing the BIOS Optimization Guide, affectionately known... Read here
Buy The BOG Book Subscribe To The BOG! Latest Money Savers!
Western Digital Caviar Green (WD20EARX) 2 TB Hard Disk Drive Review
Digg! Reddit!Add to Reddit | Bookmark this article:

Transfer Rate Range

This chart shows you the range of platter-to-buffer transfer rates from the innermost track to the outermost track. In other words, it shows you the range of disk transfer rates of the hard drives (from minimum and maximum).

The new WD20EARX was surprisingly slower than the older 2 TB Western Digital Caviar Green (WD20EARS). Although Western Digital claimed that both drives ran at the same spindle speed, our test results showed that the new WD20EARS is actually spinning slower by about 4.6%.

The reduced spindle speed puts the new 2 TB Caviar Green just a tad behind the latest 3 TB Western Digital Caviar Green 6 Gbps (WD30EZRX) hard disk drive. Both these drives have the same throughput at the outer tracks, but the WD30EZRX won at the end, due to its better performance at the slower inner tracks.



Platter Transfer Rate Profile

Here, we compared the WD20EARX's platter profile with its SATA 3.0 Gb/s brother, the Western Digital WD20EARS.

The maximum platter transfer rate appeared to be about 128 MB/s which progressively dropped across the platter to about 50 MB/s at the last track. This drive has about 21 density zones. The platter quality seems to be very good in this sample, with only one large dip that would suggest the use of replacement sectors.

As you can see, the new WD20EARX is slightly slower than the previous generation WD20EARS. Therefore, even though the WD20EARX supports SATA 6.0 Gb/s while the WD20EARS can only support SATA 3.0 Gbps, we expect the older WD20EARS to deliver better performance than the new WD20EARX.


Support Tech ARP!

If you like our work, you can help support out work by visiting our sponsors, participate in the Tech ARP Forums, or even donate to our fund. Any help you can render is greatly appreciated!




Western Digital WD20EARX Overview


Introduction, Packaging


The Improved 2 TB WD Caviar Green
Usable Capacity, Specifications


Connectors & Jumpers, Breather Holes


Testing The Improved 2 TB Caviar Green
Maximum Surface Temperature


Transfer Rate Range
Platter Transfer Rate Profile


WinBench 99 Test Results


IO Meter Random Access Performance


IO Meter Sequential Access Performance


IOPS Scaling (Random Access)


IOPS Scaling (Sequential Access)



Western Digital Black² (WD1001X06XDTL) Dual Drive Review Rev. 2.0
Windows Anytime Upgrade For Windows 7 Revealed!
Secret Pre-Release Details On Windows XP Service Pack 3
Missing Resolutions In Crysis
Performance Improvements In Crysis 1.1
The October '07 Samsung-Tech ARP Bloggers TT Program Rev. 4.0
Intel Matrix RAID Guide
Dell Pocket DJ Review
Notebook Purchase Fiasco
GeCube Radeon 9600XT Graphics Card Review


Copyright © Tech All rights reserved.