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1answer
8 views

speed of USB 3 when connected to several USB 2 devices

I am wondering what is the speed of a USB 3 hub when 2 or more USB 2 are connected to it? to be more specific: Assume that I have a USB 3 device which is connected to say 2 USB camera. Each USB ...
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1answer
56 views

USB host controllers broken on every reboot

Something happened (including Windows Updates?) and now every time I reboot, most of my USB host controllers/root hubs are not working: The broken ones say: This device cannot start. (Code 10) ...
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1answer
134 views

Why does my generic USB hub not allow my PC to find a second plugged-in flash drive?

On my Dell Model i3531-1200BK (running Windows 8.1) I am using a 4 slot (no name) generic USB hub that works fine with one flash drive. But when a second flash drive is inserted, the laptop starts ...
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1answer
47 views

Maximum number of keyboards you can attach

I need to attach 16 keyboards to a computer, to use as a game show buzzer system. Is that possible? I know the theoretical maximum number of USB devices allowed is (2^7)-1=127 but will there be any ...
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1answer
429 views

Do USB devices draw current from the computer if a powered hub's current “runs out”?

I have a few heavy duty devices and a powered hub and I wonder what's the flow of current in those things.
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1answer
222 views

Installing an internal Delock USB hub

I am installing an internal Delock 4-port USB 3.0 hub, so that I can have USB ports on the front panel of the machine. I have plugged in the 4-pin cord, but I have a blue cord that has a USB contact ...
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1answer
1k views

Only any one port in the 4 port usb hub is working

I recently bought a 4 port usb hub. I happened to find that only any one port among the 4 ports are working in my laptop. (i.e. all ports are working but only one at a time) Brand of my laptop is ...
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0answers
208 views

Why would attaching a USB hub affected the performance on a Mac?

My brother-in-law bought a 10 port active USB hub and connected it to his iMac(it's couple of years old). Over the course of about a week he noticed that his computer's performance has slowed quite a ...
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0answers
323 views

USB Hub vs. Dockinstation USB vs. Laptop USB

I recently had thougts about my current setup in my office, especially about the UBS ports distribution. Here's my setup: I have a Lenovo T410 docked to a Lenovo Dockingstation Series 3, that ...
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0answers
8 views

Optimize linux USB hub IO scheduling for external harddrives

When using several harddrives on an USB 3.0 hub, copying large files between them gives transfer rates far below expectation. My guess is, that the hub introduces contention delays as we see if ...
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vote
0answers
112 views

USB hub advertised as 2.0 actually works as 1.1

I bought this USB hub http://www.ebay.com/itm/281298880612 which is supposed to be a USB 2.0 hub. When I plug a pendrive in to the hub, Windows gives the message "This device can perform faster if you ...
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0answers
309 views

USB Hub powers down in sleep mode on Win 7 x64

I would like the USB hub to remain on in sleep so I can wake up the laptop from an external keyboard and mouse. I have set all the device drivers by unchecking allow this device to be powered down ...
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0answers
20 views

Pendrive recognized as USB 1.1 device

I have just pluged-in my old USB pendrive to simple nettop with Windows 7 on board. I used every of three USB ports and in each of them I saw standard Windows notice, that this device can work much ...
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0answers
31 views

USB 3 hub does not work until unplugged and plugged back in

I got fed up of contorting myself to reach the back of my PC whenever I wanted to plug something in, so I bought a USB 3 hub so that it could be on my desk and I'd only have to reach over to it on my ...
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0answers
331 views

USB hub damages an external hard disk (and storage devices) on use attempt

I recently bought a USB hub because I find myself needing more than just two USB ports on my prebuilt laptop. However I come to the problem that when I use an external hard disk with it I cannot ...
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0answers
362 views

Can I power a nexus 7 through a powered USB hub?

I am building a setup to use my Google Nexus 7 as a SNES. I have the games figured out, and my plan is to plug a USB hub into my OTG cable which is plugged into the device. In the hub, there are two ...
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0answers
192 views

Why doesn't my computer see all USB devices (27 3G modems)?

I have a (Dell) laptop with 3 USB ports. There are two USB hubs connected (13 ports each, hubs are powered by external electric source); so in total there are 27 USB ports (13+13+1). Each port has a ...