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I bought a brand new HDD(Seagate ST2000DMZ08, 2TB, 7200rpm) for my desktop PC running Windows 10, a month ago. When I installed it, I was getting about a 230mb/s read speed along with a 195mb/s write speed(tested with Crystaldisk mark). I have a not even 1 year old PC, with 1 SSD,and 2 HDD(one HDD that came already installed and one that I added 1 month ago).

Now I noticed since maybe a week or two that the speed of the second HDD(the one I installed a month ago brand new) is now horribly slow; but only mainly in write speed.

When testing, I get ok read speed(sometimes slower than expected though), but the write speed is just incredibly slow(about 1-3mb/s).

In the windows process explorer, under performance, it says that the average response time for that hard drive is 3000ms+, wich isnt normal..

I have no idea why it randomly started to be so slow. And its only that brand new drive that is so slow.And it was fine in the beginning when I installed it. I used a available SATA power cable that was already in the PC, and I bought a SATA DATA cable(brand new again) since there was no DATA cable provided in the PC.

Could the DATA cable suddenly turned defective? Or the hard drive be?

thank you

  • You didn't say what OS, but depending on that, you may have to manually defragment it. You didn't say what model of hard drive, but you should run the diagnostics from the manufacturer of the drive first. – Jason Sep 6 '19 at 20:51
  • @Jason its a Seagate ST2000DMZ08, 2TB and 7200rpm. I am using Windows 10. I will add these details in the post. There is barely 250GB used out of 2TB on the hard drive. – William Weifenbach Sep 6 '19 at 21:36
  • If you power down the computer and do cold boot, does the speed improve? – harrymc Sep 7 '19 at 18:05
  • @harrymc No, its still really slow – William Weifenbach Sep 7 '19 at 18:21
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I believe that the only explanation is that the disk is defective.

I suggest to activate the guarantee and demand its replacement.

My own experience with Seagate is that they readily replace the disk without asking questions. However, as you will need to send them the disk to get it replaced, prepare and keep some proof before the disk is sent, in case it is actually demanded later on.

I suggest to check the SMART data of the disk, which may contain some hint of the nature of the defect. You may post it here if you want our opinion.

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  • Even a brand new 1 month old HDD could be suddenly defective? Because it was fine when I got it, write speed were decent.. Could it possibly be the SATA data or power cable thats defective or? – William Weifenbach Sep 7 '19 at 18:35
  • Anything is possible, but keep an eye on the guarantee date limit while you are checking. My own opinion is that any such problem should have shown up soon enough, not one month later. – harrymc Sep 7 '19 at 18:37
  • You are right. I think im going the check the cable just in case, since the data cable I bought was pretty cheap.. maybe the quality was pretty bad too. And the drive is definately still under warranty, I think Seagate warranty for HDD is 2 years. I just hope the issue is not coming from the PC itself(motherboard or other) but I doubt it. – William Weifenbach Sep 7 '19 at 19:17
  • I agree that if the cable was installed by yourself then it should be checked, just in case, before claiming guarantee. Cable quality does matter. – harrymc Sep 7 '19 at 19:41
  • well the PC already had a not in use SATA power cable tied next to the original hard drive in the case. So I took the Seagate hard drive I had bought a month ago, screwed it in the right spot, then connected that one sata power cable to it, and then i bought a SATA DATA cable in an electronics store for a little less than 5$ and connected the seagate HDD to the motherboard using that sata data cable. And it was working perfectly in the beginning. I also have an external 3.5" HDD USB enclosure, I could test the HDD using it to see if the HDD is really the problem or not. – William Weifenbach Sep 7 '19 at 19:51

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