Windows 10: MsMpEng.exe use large amount of I/O write bytes

I'm running Windows 10 Home version 1909
I notice that MsMpEng.exe a.k.a. Windows Defender Antivirus Service is doing large amount of I/O write bytes on my hard disk.

It's one of the top offender in I/O write bytes usage. I could see this from Task Manager.

e.g. On my machine, it's writing close to 4GB of data on disk. And I can see it continually does that on the background.


I'm just wondering.

I can certainly understand that Antivirus would do a lot of Disk Reading, as it's doing a lot of scanning and real-time monitoring.

However, I cannot understand what it's doing with such huge amount of "I/O write bytes".

What kind of data it's trying to write, of such huge amount?

Log files or even definition updates would not be that large.


I certainly understand and appreciate the important job Windows Defender Antivirus is doing.

I rely on it, and I would give it a high rating. And I think it deserve good amount of computing resource for doing such important job.


However, I'm just perplexed at this behavior, and wonder if anyone might know.

:)

 

MsMpENG.exe using over 50% of CPU.

In that case, try to add MsMpEng.exe to the exclusion list:
"C:\Program Files\Windows Defender\MsMpEng.exe"

 

How To Format A Write Protected Flash Memory ?

¿You already tried this one?...

Run CMD


1. diskpart
2. list disk

Then in the 3º step, put the correct number of disk in the list for the usb flash (if it's listed in disk 3, then you'll have to write select disk 3).

2. select disk #
3. clean
4. create partition primary
5. select partition 1
6. active
7. format fs=fat32
8. assign
9. exit

with that commands you will format the flash drive in fat32, if you have a large drive you can select also "format fs=ntfs" in step 7.

good luck!

 

Windows 10 100% Disk Usage on startup.

Hi,

Thank you for responding.

I suggest you to try the below steps and check if it helps.

Step 1: First of all, take a note of the processes or applications that is running when the computer runs with high disk usage. Also, we need to find the applications that are running at startup.

Follow the steps to check for the processes under Task Manager:

• Press Ctrl+Shift+Esc to open Task Manager.
  
• Click on Processes tab. Check if any of the processes consumes high memory usage.

Bad sectors on the hard drive can be a cause for high disk usage.

Check which process is utilizing the Hard Disk on Windows 8.1, you may try the following steps.

• Open Task Manager and click on
  Details tab.
• Right click the columns headers and click "Select Columns".
• From the "Select Columns" window, check: I/O Reads, I/O Writes, I/O read bytes, I/O write bytes and then click
  OK.
• Now the columns will be added to the view and will display how much each process is utilizing from the hard disk.
• Sort by I/O read bytes or I/O write bytes by clicking on the column header to see which process is utilizing the Hard Drive most.

Step 2: If you have not run the 'check disk' scan or tried optimizing the drive, follow the steps from this article.

Improve performance by optimizing your drive

(Note: This applies to Windows 10 also.)

Important: While performing check disk on the hard drive, if any bad sectors are found on the hard drive, it tries to repair that sector and any data available on that might be lost.

Hope it helps. Feel free to get back to us for any further queries or issues related to Windows Operating System, we will be happy to help you.