Question Sandisk Extreme 1TB Poor Performance

[edencorbin]

My extrenal ssd (SanDisk Extreme Portable SSD ) should get around 500MB read / write to my understanding, I’m getting closer to 40, I ran CrystalDiskMark on it with the results below. I tried usb c - usb c, in my usb-c thunderbolt (not applicable here) port, for the below results. I then tried usb-c (the device port) to another USB 3 port on a different port and got very similar results. It's formatted as it arrived exFat and I have never formatted it. I am using 80% of the drive, perhaps that is the issue (unfortunately I did not test it on arrival). I do access / write files from both windows and linux dual boot (though mostly windows). I'm on a Lenovo Y740 laptop.

Any general troubleshooting steps?
Can I determine that the drive itself is the bottleneck not a setting / software / port issue?
Can I rule out bad cables as I tried a seperate usb-c => usb-c and usb-c => usb 3.0 with identical results?

Appreciate any suggestions.

CrystalDiskMark 6.0.2 x64 © 2007-2018 hiyohiyo
Crystal Dew World : https://crystalmark.info/

• MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
• KB = 1000 bytes, KiB = 1024 bytes
  Sequential Read (Q= 32,T= 1) : 39.949 MB/s
  Sequential Write (Q= 32,T= 1) : 43.698 MB/s
  Random Read 4KiB (Q= 8,T= 8) : 27.784 MB/s [ 6783.2 IOPS]
  Random Write 4KiB (Q= 8,T= 8) : 26.475 MB/s [ 6463.6 IOPS]
  Random Read 4KiB (Q= 32,T= 1) : 27.209 MB/s [ 6642.8 IOPS]
  Random Write 4KiB (Q= 32,T= 1) : 26.432 MB/s [ 6453.1 IOPS]
  Random Read 4KiB (Q= 1,T= 1) : 11.987 MB/s [ 2926.5 IOPS]
  Random Write 4KiB (Q= 1,T= 1) : 15.307 MB/s [ 3737.1 IOPS]
  Test : 100 MiB [D: 79.3% (738.3/931.5 GiB)] (x5) [Interval=5 sec]
  Date : 2020/07/13 2:55:00
  OS : Windows 10 Professional [10.0 Build 19041] (x64)

 

[popatim]

You need to be connected to a USB3 port. Your speeds reflect USB2 speeds.

 

[edencorbin]

You need to be connected to a USB3 port. Your speeds reflect USB2 speeds.

Its 3.0 actually and the usb-c / thunderbolt is definitely 3.0+ right? At least that is what the port should be operating at, should I test some thumb drives for speed maybe?