Horribly slow write speed of HDD

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+, which isn't normal..

I have no idea why it randomly started to be so slow. And it's 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?

Solution 1:

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.