Question Super slow SSD write speed

Aug 5, 2022
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Hello,

I recently bought a new Lexar 240GB SSD for my laptop. After using it for a few days, I ran CrystalDiskMark and notice something. Its write speed is super slow and when it reach 100%, its average latency is 18000ms.



 
Hello,

I recently bought a new Lexar 240GB SSD for my laptop. After using it for a few days, I ran CrystalDiskMark and notice something. Its write speed is super slow and when it reach 100%, its average latency is 18000ms.



Does it have write caching disabled?

I believe it's common for write caching to be disabled by default for laptops. You can check in Device Manager, Disk Drives, right click on the specific drive, then Policies tab. Take notice of the caution.
 
Reactions: strkss
Aug 5, 2022
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Does it have write caching disabled?

I believe it's common for write caching to be disabled by default for laptops. You can check in Device Manager, Disk Drives, right click on the specific drive, then Policies tab. Take notice of the caution.
I have already enabled write caching.
 
You have something seriously wrong going on with partition configuration there.
Did you photoshop the image?

  1. Bootloader is on 500GB disk (not on windows OS disk).
  2. Bootloader partition (with "System" in description) is not Active.
  3. You have EFI system partition on MBR drive?! How did you do that? And it is active partition.
 
Reactions: strkss
CrystalDiskInfo suggests the drive has accumulated over 35TB of writes within just 82 power-on hours, which would imply the average write speed during that period has been over 100MB/s, or at least was at some point. Assuming that number is not being misreported, it would also imply that the drive is well on its way to wearing out within a matter of weeks. Is there something on this system that might be writing to the drive non-stop? Check task manager to see if any processes are heavily writing to it.
 
Reactions: strkss
Aug 5, 2022
8
0
10
0
You have something seriously wrong going on with partition configuration there.
Did you photoshop the image?

  1. Bootloader is on 500GB disk (not on windows OS disk).
  2. Bootloader partition (with "System" in description) is not Active.
  3. You have EFI system partition on MBR drive?! How did you do that? And it is active partition.
My previous Windows installation was on HDD and my boot mode is Legacy (I install Ubuntu on HDD). How can I fix that?
 
Aug 5, 2022
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CrystalDiskInfo suggests the drive has accumulated over 35TB of writes within just 82 power-on hours, which would imply the average write speed during that period has been over 100MB/s, or at least was at some point. Assuming that number is not being misreported, it would also imply that the drive is well on its way to wearing out within a matter of weeks. Is there something on this system that might be writing to the drive non-stop? Check task manager to see if any processes are heavily writing to it.
I have checked task manager, no processes are heavily writing to it.
Maybe i need to fresh install Windows?
 
Aug 5, 2022
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I noticed something. After just 5 hours, my SSD Total Host Writes increases 1000GB?? I checked task manager, still no things found.
 
I noticed something. After just 5 hours, my SSD Total Host Writes increases 1000GB?? I checked task manager, still no things found.
If the writes are still accumulating rapidly, it might be worth temporarily disconnecting the drive or just not running the system to avoid excessive wear on it. The drive's flash memory cells can only be written to a number of times before they start wearing out, and 36+TB of writes on a 240GB drive would mean the entire drive has been overwritten around 150 times already. It sounds like it's getting overwritten about once per hour at the current rate. If the issue is addressed quickly and the excessive writes are stopped, the flash memory would still likely have years worth of endurance left to it under typical usage scenarios, but if left like this it could potentially wear out within the coming weeks.

The constant writes may also be why the drive has slowed down, since that would mean it hasn't had a chance to perform maintenance on areas of the drive that previously had data written to them. If the writes are stopped, it should be able to perform that maintenance, allowing it to recover performance after some time.

I have checked task manager, no processes are heavily writing to it.
Maybe i need to fresh install Windows?
A fresh install of Windows might be a good idea. Whether it happens to be malware, or just some software doing something weird in the background, a fresh install would likely take care of it, so long as the offending software doesn't get re-installed. Was this a Windows installation brought over from an old drive, or did you do a fresh install when you got the new drive?

Just make sure you back up any data from the drive that you don't want to lose prior to performing a fresh install of Windows, as it will overwrite the contents of the drive. If installing Windows to the SSD, you may also want to temporarily disconnect your other drive during the installation process, then reconnecting it afterward, just to make sure Windows doesn't mess with that drive in the process.
 

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