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Old February 18, 2008, 04:50 PM
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Default Read Times Question Raptor vs Caviar

Hi all,

I recently purchased a WD Raptor 1500 (150G) to sit next to my WD Caviar 2500KS (250G).

I ran both HD Speed and HD tach on both drives, after a fresh defrag with O&O.

Something very interesting turned up

In both cases the Raptor has better access times 8.1 vs 13.5

In both cases the Raptor took top spot for Read Speed 75.5 vs 55.4

However, and this is where I get confused

The Caviar beat out the Raptor in burst speed 170.6 to 137.4

Is this normal or do I have something wrong going on?
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Old February 18, 2008, 05:09 PM
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Burst speed is data coming directly off the HDD's cache. It's entirely possible that the cache in the Caviar is faster/more effective than the Raptors. However, this advantage is never more than temporary, because the cache can never be filled up as fast as it depletes.

To the best of the my knowledge, WD really hasn't updated the Raptor's guts in quite some time, (short of making a clear window available). Heck, the Raptor still uses the older recording technology, even though virtually everything else has gone to the Perpendicular Magnetic Recording method.
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Old February 18, 2008, 05:26 PM
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OK then its not a bad thing then. Just a slight disappointment considering it is supposed to be the best. I would have thought they would have ensured this to be a top of the line product in all aspects.
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Old February 18, 2008, 05:32 PM
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Hardly. The Raptors are actually server drives that just happen to use a SATA interface, which just happens to make them well-suited for enthusiasts. If it was actually an enthusiast drive, there's no way they wouldn't have upgraded its recording technology by this point, since the higher data density would vastly improve the sustained read/write times. (Incidentally, this is why some of the 1 TB drives are presently almost tied with the Raptors for sustained read/write, despite only spinning at 7200rpm.)
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Old February 18, 2008, 05:49 PM
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Is there any way to perform a write test with a HDD that already has data on it. Both HD Tach and HD Speed are unable to.
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Old February 18, 2008, 11:23 PM
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Quote:
Originally Posted by CasheKicker View Post
Is there any way to perform a write test with a HDD that already has data on it. Both HD Tach and HD Speed are unable to.
The reason for the difference is that the Raptor is SATA 150(max throughout-150MB/s), whereas your 2500KS is SATA3g(max throughput-300MB/s). It doesn't make the Caviar faster than the Raptor(it's not). It just means that the Caviar has higher "potential bandwidth", due to the SATA3g interface. Since the Raptor's transfer speed is ~80ishMB/s.. it doesn't even need a faster interface than SATA150.. and either does the Caviar(with transfer rate in the 60's MB/s range). Nothing's wrong, they're working fine... and there's nothing you can do about it.
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Old February 23, 2008, 01:50 AM
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Check this out CasheKicker. Here's 2 screenshots of my HD Tach runs, with my WD500GB(SE16). The first run was performed on Jan.15/08 on my ASRock 775Dual-VSTA. The second run, i just performed tonight(Feb. 23/08), on my GA-P35-DS3L...which i just got ~ 2 weeks ago. If you look at both charts... they are pretty-much a mirror duplicate of each other(almost scarily identical ), with the lone exception being Burst-Speed. The ASRock mobo only supported SATA150... the DS3L supports SATA3g. Even though the burst speed is higher on the DS3L.. it didn't even affect the chart line..one iota.

WD5000AAKS on ASRock 775Dual-VSTA



WD5000AAKS on GA-P35-DS3L




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Old February 23, 2008, 05:44 AM
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OK so here is my 2 drives along with yours for comparison. Why do both my drives have a dramatic drop. Is this also normal. Yours does not tend to do this.

Sorry about image quality. Guess I have to learn the best way to reformat the screen shot to post. Had to change size and format to get it to be accepted
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Old February 23, 2008, 06:53 AM
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Cashe, you can use Irfanview to resize/resample in 1024x768 then save in .jpg. Not much quality loss.

IrfanView - Official Homepage - one of the most popular viewers worldwide
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Old February 23, 2008, 08:05 AM
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Sweet I will give that a try after I Defrag and see if there is any marked improvement.

I would really be interested in seeing someones screen shots that is running Raid0 and one of Raid5 to see the changes. Both with a 7200Rpm system and another with Raptors.

Anyone have these configs that would like to post using HDTach on the longer test.

Be interesting seeing different rigs and setups compared in the same thread.

<<>> UPDATE

Well my drives were not that fragged anyway but performing a defrag made no real difference in performance. Maybe if the drive was heavily fragged it would have.

I also deduced that the dips in my chart were times I was doing other things while performing the test. Duhhh,

One thing very noticeable though is how the Raptor is much much louder than the Caviar. The rapter can be clearly heard doing its defrag whilst the Caviar is virtually silent.

One other thing is I have a marked improvement when testing using HD_Speed (85.5) over HD_Tach (72.5)

Also I figured out that I should not have been touching the mouse and performing other things during the test. Hence my dips in the graph.
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RIG #2 - AMD64 3500+ // Asus A8N-E // 8800GTS 512 OC // Enermax Liberty SLI 500W Modular PSU // WD Caviar 250g


Last edited by CasheKicker; February 23, 2008 at 09:01 AM.
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