1.) The most common cause is too little power for USB 3.0!
If it is an external adapter USB-3 to SATA, or IDE, it should have two connections, one for the USB3 connection and an additional one to get enough power for USB-3! ( ... see Image-1 )
It does not matter whether it is connected to Windows 10 or 8.1, if the power supply is insufficient, USB-3 works the same as USB-2.
There are fewer problems with SSD because the power consumption is lower, but here too there can be a 20% to 30% loss of speed. You will then not achieve the full data transfer rate that USB-3 can normally provide.
This speed dependency not only causes confusion among Microsoft Windows PC users, but also with Samsung smartphones, Apple Macs and Linux users. If the power supply is sufficient, it will also work with full data transfer under USB3.
2.) Further possibilities and causes for too slow USB 3.0!
The correct power supply for USB 3.0, USB 3.1 and USB 2.0 is important
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