Original Link: https://www.anandtech.com/show/2486



Western Digital's emphasis on recent product releases has been the consumer oriented GreenPower family of products. That all changed last month with the release of the Caviar SE16 320GB drives featuring their new 320GB per-platter technology. We previewed this drive and came away impressed by its excellent thermals, power management, and acoustics but depressed by performance that was not any better than previous generation drives featuring 166GB~200GB per-platter designs. We have an answer to our performance-induced depression but that will have to wait for page two.

The second drive from WD to utilize their new 320GB per-platter technology is the Caviar SE16 640GB WD6400AAKS. This areal density places WD once again in competition with Samsung's F1 lineup featuring 334GB per-platter sizes with similar thermal, acoustic, and power envelope specifications. However, Western Digital decided to branch off in a new direction with a 640GB capacity instead of sticking with the tried and true 500GB and 750GB offerings from their competitors.

While the WD 640GB drive does not fit in with the industry-standard capacity sizes, we fully understand Western Digital's rationale behind this move. This allows WD to use economies of scale with their new 320GB per-platter design and allows a natural progression up to the 1TB~1.3TB level by simply increasing platter count for each logical step. Of course, unless you use sub-prime mortgage mathematics, three 320GB platters only equals 960GB of capacity. WD engineering told us they can easily stretch the areal density of the current platter design to get to the magical 1TB capacity to match their competitors and witness the marketing group smiling (Editors Note - anyone in engineering knows just how difficult that can be).


Why Samsung did not follow this pattern and introduce a 668GB drive with two platters and four heads is beyond us (Editor - Samsung will introduce a 640GB model listed as the HD642JJ in the "near" future) as their 750GB drive is essentially the same drive as their 1TB offering featuring three platters and six heads, just with 252GB left that could easily be filled with family pictures or Flight Simulator X. Update 3/22/08 - Several readers have questioned the actual platter density size on the Samsung F1 HD753LJ. Samsung's latest product information to us had indicated 334GB per-platter technology is being utilized on this drive. However, since Samsung's website seems to offer differing information with the latest PDF specification file listing "Max 334GB Formatted Capacity per Disk", we have asked for clarification. Hopefully, we will have an answer shortly.

However, no matter what marketing decision Samsung made in regards to the "my drive is bigger than your drive terminology", the simple fact is that their new F1 product offers seriously fast performance for the dollar. Speaking of dollars, the Samsung 750GB will set you back $139.99 and the WD 640GB about $129.99 as of today at Newegg. For the bean counters out there, that equates to around 18.6 cents per gigabyte for the Samsung drive and 20.3 cents per gigabyte for the WD drive.

Our review samples arrived from WD just a few hours ago, so naturally we were curious to see how well this drive performed against recent arrivals from Samsung. After seeing the initial results, we thought it would be prudent to post early test results with this drive and provide a short synopsis of our experiences to date with Western Digital's latest product. We still do not have any new information on the Raptor product family. However, we will finally have new products from Seagate and Hitachi next week so we can finally complete this midrange roundup.

Let's take a quick look at a few key benchmarks and see how this drive compares to the Samsung F1 HD753LJ.



Test Setup



There's not too much to say about the test platform except it's fast. We are utilizing Vista 64-bit SP1 as our OS of choice now. We are still in the process of comparing our NVIDIA-based setup to the Intel X48 for future drive articles. However, performance differences between the two platforms are within 1% of each other with single drives. Native Command Queuing is enabled for all drives and the drive is formatted before each test run along with the prefetch folder being cleared. We run each benchmark five times and throw out the high and low test scores, then average the remainder for our results.

Quick Tests

We are providing PCMark Vantage results today along with initial acoustic and thermal results. The details about the PCMark Vantage HD suite tests and how results are determined can be located here. Our acoustic tests measure the decibel levels while the system is at idle and under load while running the Hard Disk test suite within PCMark Vantage. We take measurements at a distance of 5mm from the rear and front of the drive in a separate enclosure. The test room has a base acoustical level of 20dB(A).

Our thermal tests utilize sensor readings via the S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) capability of the drives as reported by utilizing the Active SMART 2.6 utility. We also utilize thermal sensors and infrared measurement devices to verify our utility results. We test our drives in an enclosed case environment. Our base temperature level in the room at the time of testing is 24C.



The WD 640GB drive generates an excellent score in the PCMark Vantage tests that simulate real-world performance patterns utilizing a variety of actual applications. The Samsung F1 750GB drive sports a 32MB buffer while the WD 640GB "gets by" with a 16MB buffer that has been highly tuned for random seeks and small sequential block sizes. The WD 640GB drive leads in all PCMark Vantage categories except the Windows Defender and Media Center applications where the Samsung exhibits exceptional results. These scores reflect our own off-line application benchmark testing, where we saw similar results because the 32MB buffer greatly assists in the read performance of large data block sizes accessed in sequential order.

The one area that really disappointed us with the WD 320GB drive was its pitiful random access times at 16.4ms. After a lengthy conversation with Western Digital, we now understand why the drive performed so poorly in this test. This also explains the good but not great application results in general. Granted, the drive still performs well, but the initial specifications lead us to believe that performance should have been greatly improved over previous generation drives. Western Digital explained the single platter 320GB drive is aimed at the entry-level market where thermals and acoustics are critical for mass acceptance of the drive by the OEM and retail customers.

WD sacrificed a small amount of performance on the 320GB drive to meet these goals. This was by design and is not an indication of the performance potential of their new technology. In fact, these same 320GB platters will be used in single-sided form eventually for the 160GB drives. According to statistics, the 160GB drives have quickly replaced the 80GB products to become the new "sweet spot" in the general market. As the capacities increase, the typical user for these products normally expects a balance between performance, thermals, and acoustics. With that in mind, WD tuned the 640GB drive for additional performance at the expense of acoustics.

As far as acoustic testing, this drive posted excellent results, although thermals were higher than we expected considering the Samsung drive is carrying an additional platter and set of heads. Even during heavy seeks, noise levels remained muted, and at idle the drive's acoustical footprint was almost silent. The numbers suggest that the 640GB is very close to the 320GB drive in acoustics. In most ways it is, but we could definitely hear a difference in the seek operations between the two drives. The Samsung F1 offered similar acoustics to the WD SE16 640GB drive but during seeks the drive had a slightly heavier tone that showed up in the recordings.

In our first application tests (additional results are coming soon), the drive has performed slightly better than the Samsung F1 in areas such as program loading, gaming, and digital image manipulation. The WD drive is slightly slower in our Nero Recode 2 benchmark and at streaming multi-gigabyte files. This is due to the differences in buffer sizes at this point as far as we can determine. However, the differences between both drives are minor and are something that the majority of users would never notice. This drive excels in providing excellent acoustics and performance while thermal management is acceptable for this capacity range.

Just how well this drive compares to the latest competition in the 750GB range is something we will answer in the near future. Even at this point in testing, the WD Caviar SE16 640GB drive already has our tentative recommendation for users looking for a larger capacity drive for a gaming or audio/video/digital image workstation. The drive is very good, but we need to pound on it for the next several days under varying conditions along with additional analysis before we can give it our full recommendation.

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