USB3.0 and Gigabit switch in NAS system

[mydownload]

Hi! I'm quite curios about USB3.0 and Gigabit switch logics in NAS system.

1. Assuming a theoretical data speed of USB3.0 is 4800Mbps and Gigabit Switch is 1000Mbps. If I buy a USB3.0 hub and plug to 2 of External HDDs with USB3.0 then plug Usb hub to Notebook and transfer data between External HDD. Will the speed share as 4800Mbps / 2 = 2400Mbps/channel?

2. From 1, if I plug off 1 External HDD and re-plug it to Notebook with different USB3.0 USB Controller and tranfer data between External HDD. Will it run at full speed 4800Mbps?

3. If I tranfer data between External HDDs that I plug on my PC and another one plugged to Noteboook which both are on connected to same NAS server, based on the theory it would have 1000Mbps speed, as bottleneck of Gigabit switch right?

4. Assuming I buy a converter from a USB3.0 to Gigabit port(as below link) ,plug External HDD to converter, then put through a Gigabit switch. Will my External HDD be deteced on NAS system?
http://www.uppic.org/image-BB6B_56AB8EF8.jpg

5. Since it's a NAS system. If I transfer data by Notebook between 2 of full 2 TB External HDDs which plugged to NAS server box. It usually may take a whole day. Can I shutdown my notebook while data still tranfering?

 

[jsmithepa]

1. Max speed 4800 mb/s regardless how many drives. HDD today are able to deliver max ~1500 mb/s.

2. Repeat #1. HDD today can go no faster than ~1500 mb/s.

3. Ethernet tops off 1 gbp/s yes will bottleneck a HD, reason why some "better" NAS have 2 ethernet ports.

4. Picture link is broken.

5. Negative. USB needs notebook to manage transfer.

You are using NAS very loosely. NAS normal definition is a SELF-CONTAINED storage system accessed via LAN, so no helping notebook, no USB. A real NAS may have a cloning mechanism to copy its drives, as per #5, without external intervention.