Re: which command can show if usb 3.0 is used

[deloptes <deloptes@gmail.com>]

Charlie Gibbs wrote:

> Is the connector blue?  It's a convention to make USB 3.0 connectors
> blue, while USB 2 connectors aren't.  My machine has a mix.
> 
> https://en.wikipedia.org/wiki/USB_3.0

I would also start with this.

USB3 (not only 3.0 but 3.x) are blue.

Then you can use dd to determine speed (knowing USB2 is about 480Mbps which
is equivalent of approx 40MB/s - AFAIR 100Mbps~=12MB/s)

In reality it looks like this

dd if=/dev/sdc of=/dev/null bs=512 status=progress
851034624 bytes (851 MB, 812 MiB) copied, 24 s, 35.5 MB/s

SATA in active RAID for example

dd if=/dev/sda of=/dev/null bs=512 status=progress
1397104128 bytes (1.4 GB, 1.3 GiB) copied, 5 s, 279 MB/s

USB3 on RPi4

dd if=/dev/sda of=/dev/null bs=512 status=progress
3767485440 bytes (3.8 GB, 3.5 GiB) copied, 48 s, 78.5 MB/s

regards