Low data speed of usb 3.0 device connected to 3.0 port

Hello everyone
I am using jetson nano developer kit.
I followed the link https://developer.nvidia.com/embedded/downloads#?search=Jetson%20Nano%20Developer%20Kit%20User%20Guide for downloading and flashing the image.
I connected a usb-3.1 pendrive which is detected as a superspeed device.

ubuntu@ubuntu-desktop:~$ lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=tegra-xusb/4p, 5000M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 5000M
|__ Port 1: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=tegra-xusb/5p, 480M
|__ Port 2: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 3: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 4: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 4: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M

I tested its data write and read speed and the results are as follows:
ubuntu@ubuntu-desktop:~# dd if=/dev/zero of=/media/5E0D9ACB43340381/test.img bs=1G count=4
4+0 records in
4+0 records out
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 126.755 s, 33.9 MB/s
ubuntu@ubuntu-desktop:~# dd if=/media/5E0D9ACB43340381/test.img of=/dev/null bs=1G count=4
4+0 records in
4+0 records out
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 36.2606 s, 118 MB/s

A USB 3.0 is detected as 5Gbps which should support 500MB/s to 625MB/s of data transfer.As per the above logs, it is clear that the write and read speed is 33.9MB/s and 118 MB/s.
I am not sure what is the reason for this low speed.
It will be very much helpful if someone revert for the same.

Thanks in advance

Regards,
Deepika S

What is the device that you’re using? What is its rated speed?

I’ve never known of any USB thumb drive even remotely near the ability to use a USB3 bus’s throughput. The data link speed is very likely far in excess of what the pendrive can sustain, and the drive itself is the limiting factor. I think @momente.gustavo is asking the correct question: Is it the pendrive which is slow, or is it the USB data pipe which is slow? If you know the model you can look up the sustained read/write speed.