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Poor speed on my 2tb drive

post #1 of 12
Thread Starter 
I have 2 WD20EARS drives. One I have had for about 2 months, the other I just got.

I was using HD Tune to check them out and found that the one I got 2 months ago has horrible transfer speeds (like a max of 10.6MB/Sec, a minimum of 9.2 MB/sec, average of 10.4 MB/sec) and the Health shows yellow on [05] Reallocated Sector Count Current 179, Threshold is 140, Data is 168.




The new one is a max of 122.7 MB/sec, minimum of 51.4MB/sec and average of 91.2MB/sec. Health shows all OK, but the [05] Reallocated Sector Count shows Current 200, Threshold is 140, Data is 0.



Neither shows any errors with the Error Scan.

The older "slow" drive is about 40% full, the new one is 20% full (about to be more since I am having everything duplicated now).
Is it slower due to having more data on it, or because of a bad drive?

The older drive has been used in a home server, and has been on basically 24/7 for the last 2 months.

I checked them both with Seatools and they both check fine, but why is the first drive so slow?



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post #2 of 12
Your hard drive might have reverted to PIO mode:

http://winhlp.com/node/10
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post #3 of 12
Seems like a good place to start. Try another SATA port and cable.
 
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post #4 of 12
are these results obtained while the drive is duplicating??? any performance tests taken while the drive is being used can skew them dramatically
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post #5 of 12
Thread Starter 
Well, with WHS, I can't tell if it is duplicating or not (and if it was, wouldn't both drives be affected?).

I tried swapping cables and SATA ports, and now have even worse results.



I may remove the drive completly and try it on another computer.
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post #6 of 12
Go back to the setup you had in the original post.

Go into Device Manager and check you drive controllers. Go through the properties and check what DMA (or PIO) mode is enabled for each drive.

The ~10.5MB/sec cap is the limit for PIO mode transfers, which is why I am 90% sure the drive is stuck in PIO mode.

EDIT: I've had multiple older drives do this do to disk read errors, but it can happen to newer drives too.
Edited by Dennisjr13 - 3/21/11 at 7:13pm
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post #7 of 12
If I'm not mistaken (I'm new, you guys know best), but aren't larger HDD's always slower? The computer has to work harder to find the files it is looking for.
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by Dennisjr13 View Post
Go back to the setup you had in the original post.

Go into Device Manager and check you drive controllers. Go through the properties and check what DMA (or PIO) mode is enabled for each drive.

The ~10.5MB/sec cap is the limit for PIO mode transfers, which is why I am 90% sure the drive is stuck in PIO mode.

EDIT: I've had multiple older drives do this do to disk read errors, but it can happen to newer drives too.
They are all set to "DMA if available"

Quote:
Originally Posted by grand View Post
If I'm not mistaken (I'm new, you guys know best), but aren't larger HDD's always slower? The computer has to work harder to find the files it is looking for.
Yes, to an extent, but I have 2 identical drives with hugely different speeds.


All this being said, I tried another cable and turned off folder duplication and speeds are about the same on both now. So not positive if it was the cable or the duplication (but am about to turn duplication back on, so I will see).
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post #9 of 12
I would say drive is having a mechanical problem, try it on another system if that doesnt fix it RMA time
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post #10 of 12
I would guess the cable if that's the only thing you changed. If only there was a way to test cables besides trial/error, but alas they are cheap!
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