Performance Of Data Transfer Between Multiple HDD's

[zanshin777]

I have 4 external HDD's (a, b, c, d) and an Anker 4-Port USB 3.0 Data Hub.

I want to transfer data in huge amounts. (a has 2TB data and b has 2TB data as well.) I'll connect all of them the USB hub.

Transfer 1 : a to b

Transfer 2 : c to d

1) Do their data transfer speed performance decrease when I make Transfer 1 and Transfer 2 activities in the same time?

2) Do connecting all of them to the USB Hub decrease data transfer speed performance rather than directly connecting them to the Computer's USB slot?

[rogfanther]

1.) Yes
2.) Still yes. Their data won´t go through the hub to the other disk. It will go to the computer in the port connected to the hub, then back through the same cable/port, then to the other hdd. So, if you can have two disks connected directly to the computer, the speed of the transfer will be bigger.

[einstein9]

1.) Yes
2.) Still yes. Their data won´t go through the hub to the other disk. It will go to the computer in the port connected to the hub, then back through the same cable/port, then to the other hdd. So, if you can have two disks connected directly to the computer, the speed of the transfer will be bigger.

+ you should know that there is some Pro. USB Hub With Power adapter (is a must) if using multiple ports together