?
Solved

USB 3.0 Capacity

Posted on 2014-12-02
4
Medium Priority
?
377 Views
Last Modified: 2014-12-02
I just purchased a new Lenovo T440s laptop (running Windows 7).  It comes with 3 USB 3.0 ports.  I currently have two of the ports occupied by USB 3.0 hubs, one with 5 devices, and the other with 7 devices.  When I plugged my iPhone into one of the hubs I got a message that I had exceed my USB host controller capacity.  How is this possible?  What does it mean?  What can I do about it?  I've used the same configuration for years with my previous T420s laptop without any issue.

Thanks,

Phil
0
Comment
Question by:philsimmons
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 56

Expert Comment

by:McKnife
ID: 40477297
The devices need electrical power, that's what it's about. The electrical output of USB ports is limited, you cannot connect just as many devices on machine A as on B because the hardware is slightly different.
To change that, use USB hubs that have their own power supply.
0
 

Author Comment

by:philsimmons
ID: 40477308
Both of my hubs have external power.
0
 
LVL 56

Accepted Solution

by:
McKnife earned 2000 total points
ID: 40477322
Interesting. Normal USB ports would let you connect more devices, maybe it's a driver/firmware bug.
Update your computer's BIOS, your USB port driver and try other USB hubs. if nothing helps, talk to the manufacturer of the hub and/or that of the computer.
0
 

Author Closing Comment

by:philsimmons
ID: 40477367
Thank you.
0

Featured Post

Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A clone is a duplicate copy. Sheep have been cloned and maybe someday even people will be cloned, but disk cloning (performed by the hard drive cloning software) is a vital tool used to manage and protect data. Let’s look at what hard drive cloning …
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
This Micro Tutorial will teach you how to change your appearance and customize your Windows 7 interface to your unique preference. This will be demonstrated using Windows 7 operating system.
The Task Scheduler is a powerful tool that is built into Windows. It allows you to schedule tasks (actions) on a recurring basis, such as hourly, daily, weekly, monthly, at log on, at startup, on idle, etc. This video Micro Tutorial is a brief intro…
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question