SD & MicroSD - Genesis Connected Solutions

I have a need to transfer a lot of data (talking about many terabytes worth of data) from SD cards to a hard disk. I am exploring the way to optimise the PC's that will be used for this task. So thinking of a modern PC (12th Gen i5) with usb3.1+. We can obviously use a SD card reader plugged into USB. Multiway SD card readers don't achieve that much extra as the bottle neck is the USB and/or the disk writes.

Would it make sense to install a further SSD and a PCIE USB card (16x slot) and have one copy go from one USB controller to one disk and another copy t the other USB controller and the other SSD. Would that pretty much double my speed or is there a bottleneck I haven't thought of?

Or does someone have any ideas about custom hardware for this sort of thing?

TIA Yeah will be an ongoing requirement until new hardware for the data collection is developed t use IOT technologies. 10's of TB a year concentrated in a 6 month period preferably. Once data is on ssd's it is then sent cloudwards????

Now here are some numbers: the PC this was done on is running W11 and no there are no other user apps are running at the time. Ohh, a thought, I wonder what effect turning off AV on these files would have . Do correct my arithmetic if any of this is wrong!
So we can achieve with current kit 25GB upload in around 8 mins (I am talking "very round" numbers here) So thats is MB in 8 mins = MB in a minute = 52MB/s =(I know 10 is not 8 but I am handwaving here) 520 Mb/s = .5Gb/s. Which suggests that USB bus is not restricting things. But we have a four way USB3.1 reader and if you put a card in all four slots we take slightly longer than 8 mins per card which suggests that USB IS the bottlneck (or something in the 4 way reader) - or AV having just thought of that.

Currently we have a small M2 system SSD and a SATA SSD. Upload speeds are noticeably but not hugely faster writing to the M2 disk which is interesting as SATA running at 6Gb/s should not be a bottleneck.

I am not a h/w person so I may have misunderstood some of these numbers or be drawing the wrong conclusion.

But I am now thinking a test turning off AV is a good idea.

M