Kinda depends on all 3 devices. Some USB devices can have extremely high burst rates before they’re heat saturated or some have ssd’s built in that can nearly peg the bus speed. Slow spindisks would be in the range of 80 mb/s or so where fast ones like sata Exos drives would be nearly 300 mb/s and sas even faster, some even bursting to max out the bus speed with their cache. Another factor is the load itself. Random access data is incredibly slow on spindisks compared to virtually any USB device, meaning lots of small files are going to crawl compared to big ones. Bit locker and tpm could be slowing it down if it needs to decrypt which isn’t likely slowing the USB drives down.
I think you’d get a better set of potential issues by being specific about the devices and interfaces.
Kinda depends on all 3 devices. Some USB devices can have extremely high burst rates before they’re heat saturated or some have ssd’s built in that can nearly peg the bus speed. Slow spindisks would be in the range of 80 mb/s or so where fast ones like sata Exos drives would be nearly 300 mb/s and sas even faster, some even bursting to max out the bus speed with their cache. Another factor is the load itself. Random access data is incredibly slow on spindisks compared to virtually any USB device, meaning lots of small files are going to crawl compared to big ones. Bit locker and tpm could be slowing it down if it needs to decrypt which isn’t likely slowing the USB drives down.
I think you’d get a better set of potential issues by being specific about the devices and interfaces.