2 TB Hard Disk Drive Battle: Seagate Barracuda LP vs. Western Digital Caviar Green
By Gabriel Torres on June 25, 2009


Introduction

So far only two 2 TB hard disk drives have reached the market and both are “green” models, meaning they rotate at lower speeds in order to save energy. Models spinning at 7,200 rpm will reach the market only by the end of the year (it is more complicated to build a 7,200 rpm 2 TB drive than a 5,400 rpm one) and they will be faster than these two models we are reviewing today. Let’s compare the performance of Seagate Barracuda LP with Western Digital Caviar Green.

Seagate Barracuda LP spins at 5,900 rpm, while Western Digital does not disclosure the rotational speed from Caviar Green (5,400 rpm is our educated guess). Hard drives typically consume between 8-10 W; “green” models like the two we are going to compare consume practically half of this.

Both 2 TB models we tested have a real capacity of 1.82 TB or 1,863 GB (3,907,029,168 sectors). As you may be aware, the capacity advertised by hard disk drive manufacturers isn’t the real drive capacity. Read our Hard Disk Drives Capacity Limits tutorial for further information on this subject.

Here is a summary of the two hard drives we are going to compare:

Manufacturer

Model

Model #

Buffer

Price

Seagate

Barracuda LP

ST32000542AS

32 MB

USD 239.99

Western Digital

Caviar Green

WD20EADS

32 MB

USD 239.99

Prices were reasearched at Newegg.com on the day we published this review.

Now let’s see which drive is the fastest 2 TB product.

How We Tested

During our tests we used the configuration listed below and the only variable component between each benchmarking session was the hard disk drive being tested.

Hardware Configuration

Software Configuration

Benchmarking Software

We adopted a 3% error margin. So, performance differences below 3% cannot be considered meaningful. In other words, products where the performance difference is below 3% must be considered as having similar performance.

HD Tach

Usually we use three programs to evaluate hard disk drive performance, DiskSpeed32, HD Tach and HD Tune. DiskSpeed32, however, would freeze exactly in the middle of the data gathering process and our best guess is that this program isn’t compatible with 2 TB drives. Thus unfortunately we had to keep it out of our benchmarking process.

HD Tach provides only two results, the burst transfer rate and the average transfer rate. We ran the “long bench” test from this program.

Seagate Barracuda LP 2 TB vs. Western Digital Caviar Green 2 TB

On the burst transfer rate measured by HD Tach Western Digital Caviar Green 2 TB was 6% faster than Seagate Barracuda LP 2 TB. Keep in mind that the burst transfer rate measures the maximum transfer rate between the motherboard SATA port and the hard disk drive controller located on the drive itself, and may not represent real-world performance.

Seagate Barracuda LP 2 TB vs. Western Digital Caviar Green 2 TB

Average transfer is certainly the most important parameter for the regular PC user and on HD Tach Seagate Barracuda LP 2 TB was 20% faster than Western Digital Caviar Green 2 TB.

HD Tach: Read Curves

If you are interested, you can find below the read curves plotted by HD Tach for the two hard disk drives tested.

Seagate Barracuda LP 2 TB
Seagate Barracuda LP 2 TB
click to enlarge

Western Digital Caviar Green 2 TB
Western Digital Caviar Green 2 TB
click to enlarge

HD Tune

Now we have the results provided by HD Tune.

Seagate Barracuda LP 2 TB vs. Western Digital Caviar Green 2 TB

Here Seagate Barracuda LP 2 TB was 23% faster than Western Digital Caviar Green 2 TB. Keep in mind that the burst transfer rate measures the maximum transfer rate between the motherboard SATA port and the hard disk drive controller located on the drive itself, and may not represent real-world performance.

Seagate Barracuda LP 2 TB vs. Western Digital Caviar Green 2 TB

The most important figure for most people is the average transfer rate. Here Seagate Barracuda LP 2 TB was 21% faster than Western Digital Caviar Green 2 TB.

Seagate Barracuda LP 2 TB vs. Western Digital Caviar Green 2 TB

The maximum transfer rate is achieved when the hard drive is reading data from its outer-most tracks.

Here Seagate Barracuda LP 2 TB was 25% faster than Western Digital Caviar Green 2 TB.

Seagate Barracuda LP 2 TB vs. Western Digital Caviar Green 2 TB

The minimum transfer rate is achieved when the hard drive is reading data from its inner-most tracks.

Here Seagate Barracuda LP 2 TB was 17% faster than Western Digital Caviar Green 2 TB.

HD Tune: Read Curves

If you are interested, you can find below the read curves plotted by HD Tune for the two hard disk drives tested.

Seagate Barracuda LP 2 TB
Seagate Barracuda LP 2 TB
click to enlarge

Western Digital Caviar Green 2 TB
Western Digital Caviar Green 2 TB
click to enlarge

Access Time

Access time is another important measurement. It measures the time the hard disk drive delays to start delivering data after the computer has asked a given data. It is measured in the order of milliseconds (ms, which is equal to 0.001 s) and the lower this value, the better.

The results presented by the two programs were slightly different, so this time we plotted a chart showing the two programs.

Seagate Barracuda LP 2 TB vs. Western Digital Caviar Green 2 TB

In both programs Seagate Barracuda LP 2 TB achieved a better performance. On HD Tach it presented an access time 18% lower than Western Digital Caviar Green 2 TB, while on HD Tune it presented an access time 14% lower than its competitor.

Conclusions

It is crystal clear that the fastest 2 TB hard disk drive available today is Barracuda LP from Seagate, which is 20% faster than its main competitor, Western Digital Caviar Green. Of course this scenario will change when 7,200 rpm products arrive on the market by the end of the year.

Price- and performance-wise today it only makes sense buying 2 TB units if you really don’t have enough bays to install several 1 TB drives. Not only 1 TB drives are cheaper (it is cheaper to buy two 1 TB drives than a single 2 TB unit), they are also faster, plus you can install two 1 TB drives in RAID0 in order to increase performance even more.

Originally at http://www.hardwaresecrets.com/article/2-TB-Hard-Disk-Drive-Battle-Seagate-Barracuda-LP-vs-Western-Digital-Caviar-Green/744


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