Question Seagate HDD Write Speeds Extremly Slow (3MB/s)

Sep 1, 2017
Hi, yesterday I found out that for some reason my Seagate ST4000DM004-2CV104 Hard Drive has very slow write speeds. But for some reason only write speeds. Read speeds are fine.

What I've done:
  • Checked S.M.A.R.T. Stats (all okay)
  • Ran several diagnostic tools like SeaTools and Information software like CrystalDiskInfo which didn't say anything strange.
  • Plugged my HDD into a different SATA port.
  • Tried to update firmware but there is no update available
  • Checked for Viruses with Windows Defender, Malwarebytes and Avast Antivirus
  • Checked for Programs that take up a lot of disk usage.
I don't know what to do because everything says its fine, but it's obviously not.
I've had this drive for about 3-4 Months

This is my latest CrystalDiskMark test:

Sequential Read (Q= 32,T= 1) : 369.404 MB/s
Sequential Write (Q= 32,T= 1) : 3.984 MB/s
Random Read 4KiB (Q= 32,T= 1) : 8.252 MB/s [ 2014.6 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 0.103 MB/s [ 25.1 IOPS]
Sequential Read (T= 1) : 307.356 MB/s
Sequential Write (T= 1) : 3.145 MB/s
Random Read 4KiB (Q= 1,T= 1) : 5.348 MB/s [ 1305.7 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 0.008 MB/s [ 2.0 IOPS]

These are the S.M.A.R.T stats from the drive in question:

  • CPU: i5 6600k @ 4.5 GHz
  • GPU: NVidia GTX 1060 6GB
  • RAM: 16 GB DDR4
  • Motherboard: Z170A Gaming Pro Carbon
  • Other Drives: Samsung SSD 840 EVO 232 GB (OS Drive), Seagate ST2000DL003-9VT166 1864 GB
Sep 1, 2017
Which BIOS are you on for your motherboard, at the moment? What is the make and model of your PSU and how old is it? You might also want to state which OS you're on(and which version)?
  • I am on Windows 10 Edited
  • My BIOS is "MSI Click Bios 5" Version: E7A12IMS.190 Date: 01/25/2018
  • My PSU is a "Be Quiet! Pure Power CM L8 730W" I believe its about 6-7 years old
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