Raptor X + WD5000AAKS HDTune

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MuttonFlanks

n00b
Joined
Jan 8, 2007
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Just ran HDTune on my two hard drives and here are the results. Not sure if they are good or not but thought I'd share the info. Seems like the numbers are pretty close...

Raptor X:
hdtunebenchmarkwdcwd150wx4.png



WD5000AAKS:
hdtunebenchmarkwdcwd500jt7.png
 
Hi,

You just compared the latest series 500GB PMR 7200RPM disk and a quite old 150GB LMR 10000RPM harddisk.

The sustained data rate graphs look very similar at first glance. But the WD Raptor ends at 55MB/s for the slowest media zone, while the WD50000AAKS ends at 40MB/s for the slowest media zone. But that's no big deal. But take a look at the lines: The WD Raptor offers a clean stairstep graph, while the WD5000AAKS has a very jagged look. The WD Raptor does not miss a single sector in the first attempt while reading, the WD5000AAKS has lots of glitches.

If you take a look at the random access, you can see a huge difference: The WD Raptor has an average of 8.3ms and a worst rate of about 28ms while the WD5000AAKS has an average of 13.4ms and a worst rate of about 48ms!

OTOH, the WD Raptor only offers 150GB and the WD5000AAKS offers 500GB, so if you would use only 150GB of the WD5000AAKS, the results would look completely different.

For harddisk performance, there's only one true benchmark result: "It depends..."

Hans-Jürgen
 
Thanks for the explanation, that helped me understand things a bit better :) I just posted the graphs for people who were interested in the info :cool:
 
Hi,

In this case, it's "especially" old due to the step from LMR to PMR. But I would still call a 1 year "old" harddisk old.

Just take a look at the 15,000RPM SCSI harddisks: The last LMR models do 92-96MB/s max. sustained data rate, the first PMR model does 125MB/s max. sustained data rate.

A "PMR Raptor" could easily perform at 110MB/s max. sustained data rate, so the graph would go down from 110MB/s down to 70MB/s, the minimum sustained data rate would then be just a little below the maximum sustained data rate of the WD5000AAKS.

Hans-Jürgen
 
to make a correction,

the wd5000ks does not use pmr (no wd desktop drives do), and there are two scales on the hdtach graph, one on the left in MB/s and the right one in ms
 
Hi,

g33k said:
to make a correction,

the wd5000ks does not use pmr (no wd desktop drives do), and there are two scales on the hdtach graph, one on the left in MB/s and the right one in ms
Click to expand...

To correct your correction: There is AA between "WD5000" and "KS", so this is the WD5000AAKS, the *new* 3-disk PMR model. You can't get 85MB/s from a 7200RPM 3.5" LMR disk.

Hans-Jürgen
 
That WD500 is a beast of a 7.2k drive. I'm glad I picked one up last month, I've been quite impressed and would buy a second if I weren't hurting for power right now.
 
I did some more searching. the wd5000aaks does not use pmr, although the wd1600aajs (laptop drive) does, which is probably where the confusion started. the wd5000aaks uses 160 GB (166 for 500gb drives) platters and lmr technology.
http://forums.storagereview.net/index.php?showtopic=23162&hl=wd%20 perpendicular&st=50

also here's the press release for wd's 160 gb platters. no mention of pmr.
http://www.wdc.com/en/company/relea...elease={43FE74C0-93E6-4092-8C89-DF8A6E93CCAA}

...and wd's 80gb pmr platters for laptops on the same day
http://www.wdc.com/en/company/relea...elease={774FADA9-FCD1-4028-BF32-A7F536029C85}
 
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