[SOLVED] USB Transfer Speed

[wm3797]

I am transfering a 3.7 GB file from external portable ssd through a USB 3.0 port to the desktop's samsung ssd. The transfer speed was around 30 MB per second. Why is it so slow

 

[jay32267]

Are you sure is was 310 megabytes per second and not megabits per second?

 

[USAFRet]

the letter b after M is uppercase, so yup

And what is showing you this 310MB/sec?
Screencap if you can.

 

[wm3797]

And what is showing you this 310MB/sec?
Screencap if you can.

Wrong question before. I was going to say why is the USB 3.0 port so slow

 

[Nemesia]

The variables changed. What is that external SSD brand and model and what is the model of your samsung SSD?

 

[wm3797]

The variables changed. What is that external SSD brand and model and what is the model of your samsung SSD?

External = WD 1TB My Passport Go SSD
Samsung SSD = Samsung 860 QVO 1 TB

 

[USAFRet]

860 QVO.
Once the cache is full, the write speed drops to near HDD level. For sustained write ops, this will happen fairly quickly.

 

[wm3797]

860 QVO.
Once the cache is full, the write speed drops to near HDD level. For sustained write ops, this will happen fairly quickly.

May I ask how exactly the cache works? and does it say it on the SSD specs?

 

[USAFRet]

May I ask how exactly the cache works? and does it say it on the SSD specs?

It is a small DRAM space of fast(er) memory. In the 1TB drive, that space is 1GB.
Once that fills up, then the performance drops way down.

Gives a good burst speed, not so good for sustained writes, such at a 3.7GB file.

In the specs from Samsung?
Not really.

Samsung SSD 860 QVO | Samsung V-NAND Consumer SSD

Powered by Samsung's V-NAND, Samsung 860 QVO is terabyte capacity SSD for improving everyday computing with Samsung's 4-bit MLC NAND flash technology.

www.samsung.com

But, multiple reviews say the same.
Here's one: https://www.anandtech.com/show/13633/the-samsung-860-qvo-ssd-review

If you notice, the 1TB 860 QVO is at the bottom, below a 7200 RPM WD Black HDD.
And about 1/3 the performance of the 860 EVO.