USB Hub problem?

Hi,
I have a USB hub, 7ports / USB 2.0/1.1 powered by a mains adaptor.
I am connecting 1 x USB 3 external drive 750 GB (partitioned into two sections) and 1 x USB 2 500 GB external drive. I use these for mixture of storage and backup, and exchange data between them.
Both drives work perfectly well when I connect one at a time (the USB 3 is always connected at startup) but when I insert the USB 2 device into the hub, the first devive (USB 3 partitioned) disconnects and I get the standard warning " disc was not ejected properly" etc. etc.
(I know the MacBook has 2 x USB inserts, but one is connected permanently to an audio capture device - non negotiable)!
Would this be because the hub is not suitable for USB 3 devices, or some other reason. Any advice would be greatly appreciated!
Many Thanks............Brian

btw_2010 wrote:
Both drives work perfectly well when I connect one at a time (the USB 3 is always connected at startup) but when I insert the USB 2 device into the hub, the first devive (USB 3 partitioned) disconnects
My suspicion is that the hub doesn't provide enough power for both drives. Check the specs (power or current consumption) for the drives and the hub. Keep in mind that, often enough, especially on cheaper hubs, the power supply ratings are wildly optimistic. Eg, the power supply may be rated for 1A, but effectively delivers only 0.8A; if each drive needs 0.5A, connecting both at the same time won't work.

Similar Messages

PPC Update 10.4.7 and USB hub problems

Hi,
After installing the PPC 10.4.7 combo update on my PowerPC G5 dual 2.7 GHz (4GB RAM) I have problems with my USB hub. The update seemed to have been installed properly (two reboots and no error messages) but since then my Kensington track ball does no longer work after power on. I have to detach and reattach the USB hub to reactivate the trackball. The problem does not occur after a restart (only after a power off/on cycle).
The USB hub did work before the update and I did not change the configuration after the update.
I hope someone can help me with this as it is very frustrating for me to crawl under my desk to detach and reattach the USB hub every time I turn on my mac...
Thanks for any help!

Hi,
After installing the PPC 10.4.7 combo update on my
PowerPC G5 dual 2.7 GHz (4GB RAM) I have problems
with my USB hub. The update seemed to have been
installed properly (two reboots and no error
messages) but since then my Kensington track ball
does no longer work after power on. I have to detach
and reattach the USB hub to reactivate the trackball.
The problem does not occur after a restart (only
after a power off/on cycle).
The USB hub did work before the update and I did not
change the configuration after the update.
I hope someone can help me with this as it is very
frustrating for me to crawl under my desk to detach
and reattach the USB hub every time I turn on my
mac...
Thanks for any help!
I can't help you, but I wanted to say that I have a similar problem. After a sleep/wake, my hub doesn't wake up. I have done a bunch of troubleshooting, including buying a new hub, which did not solve the problem (I took it back). When I reboot, all is back to normal. I have a 2001 Powermac G4 with a Sonnet Allegro USB 2.0 card that I added, over a year ago. It has worked fine since I bought it. Now, after upgrading to OS 10.4.7, I have this sleep/wake problem with the USB hub (Keyspan).
I have checked the ports on the USB card and I have found that at least one port is dead when I wake the machine back up. I can switch over devices around and they work in the remaining three ports on the board. The hub, however, does not work at all in any port, until after a reboot. There must be some special signal that the board sends out to the hub that resets it after a boot. I don't know. It's very frustrating, though. I don't like waiting for a reboot, which is why I have gotten in the habit of using sleep.
Maybe someone else has some idea what might be causing this problem? It could be just a coincidence that it started soon after the OS update. Maybe the board just decided to go bad at this particular time...?
Rich
PowerMac G4 2001 Quicksilver Mac OS X (10.4.7) Sonnet Allegro USB 2.0, Sonnet Encore ST G4 Duet, ATI Radeon 9000 Pro

Windows 7 , hp c4280 and a logitech usb hub problem

i have a hp c4280 printer (it is an all in one printer with copier and scanner)
he works fine on the usb port but if i want to connect the printer tru a usb hub like this http://www.onlineshop.com.sg/index.php?main_page=product_info&products_id=4764&zenid=41926e11ee1272dbb86567a0915bef4a
the scanner of the printer dosen"t work
if i want to print something it works only if i wand to scan something i get the folow error
http://i26.tinypic.com/99dkep.jpg

Hi,
you may try skipping the system check and check if that may bypass the problem,
When the System Requirements Check window appears, click on the Cancel button while holding the Ctrl+Shift keys. This will bypass the sys. req. check and continue the installation. You may need to do this several times for the installation to proceed.
If that doesn't help I would recomemnd ensuring that you have the latest USB drivers for your PC, please clarify your PC model and I would try pointing you further as possible.
Shlomi
Say thanks by clicking the Kudos thumb up in the post.
If my post resolve your problem please mark it as an Accepted Solution

External HD + Airport Extreme + USB Hub = Problems

I'm having issues connecting my 2 external HDs to my airport extreme via USB Hub. I have a My Book 1TB HD and a 500G Maxtor OneTouch that I connected to a powered usb hub that is plugged into my Airport Extreme. It works for a minute, I can connect wirelessly to both, then it hangs up and fails to mount. When I disconnected it all and plug one of the two into the Airport Extreme, it works flawlessly. I want to use the 1TB for all my goodies and the 500G for my Time Machine Backups.
I guess my questions are these:
1. Is the USB Hub not supplying enough power or could it be that the USB Hub just cannot handle two HDs. (Its a rocketfish powered usb hub btw)
2. What four port powered usb hub would you recommed me using to connect the 1TB and 500G external HDs to my Airport Extreme?
Thank you in advance!

I am having a smiler issue i have a 1TB WD hard Drive plugged into the USB hub on my Airport Extreme. When it mounts it works great...I use it to access all of my music. The problem is it gets disconnected constantly and when it does it also takes out my Airport Express. I have to unplug the Extreme to reset it all.
Any help would be appreciated!!

Apple Keyboard USB HUB problem.

Hi, I bought this keyboard recently ( http://store.apple.com/us/product/MB...co=MTA4Mzc4ODA ), it has 2 USB ports on the side. In 1st I plugged the mouse and the other I plugged this speakers ( http://www.logitech.com/index.cfm/no...200&cl=roeu,en ). The problem is that when I'm in Windows 7 it says the hub has not energy enough to connect the devices, and the speakers do not work. Now when I'm on Mac OSX the mouse and the speakers work perfectly. Does anyone have an explanation for that?
Sorry about my english, and thank you.

well, im an idiot. disregard almost everything i just said.
Macs use EHCI/OHCI. The issue is with windows recognizing everything as low speed usb.
EHCI handles high speed usb
OHCI handles low speed usb
Windows is passing everything off to the ohci controllers whether or not they're high speed or not.
I'd still like a smarter windows usb driver, apple.

Re: Problems with USB hub in Studio Display

Ok, so I read a couple of posts here about USB hub problems with studio displays. Well... lucky me. I just got a used 17" studio LCD from craigslist.com (a local person) only to discover a day after getting it that it abruptly tries to go to sleep on its own; or the usb hubs in the back stopped responding; and/or it would intermittently flicker on and off like it was trying to go to sleep but couldn't. The screen itself is perfectly fine and clear when its own and I can get it to stay on for awhile with no problems, but just from my impression from the thing, this problem is going to continue. Was there ever a reasonable solution for this USB issue? My computer was running fine before on a 17" CRT Studio Display. And unfortunately, I've already given that one away.
<--- Poor student, so I'm hoping I'm not SOL.

Is your USB hub a self-powered one? Meaning, does it have its own external power supply?
If it is, make sure its power supply is plugged in to a live source. Also, some self-powered hubs have a small selector switch, allowing the choice of bus or self power; if it has such a switch, be sure it is not set to "bus".

Generic USB hub missing which causes Moble broadband, bluetooth, camera... not working

I've found myself in a bit of a problem.
My W510 no longer have any devices for the fingerprint reader, bluetooth, mobile broadband, integrated camera (and possibly some more).
When comparing the devices in "Device Manager" to another W510, I notice that many of the missing devices are USB devices, but also that the other machine have two "Generic USB hub" and I have two "Unknown device".
When I compare the two hubs and the two unknown devices, they have the same "Location" (i.e. Port_#0001.Hub_#0001 and Port_#0001.Hub_#0002) and I guess that the missing devices (bluetooth...) are "connected" to thoose Generic USB hubs.
If I delete (uninstall) the "Unknown device" from Device Manager and reboot, I can see that Windows detects my mobile broadband device, but during the driver installation they get "device unplugged" when the driver installation for the "Unknown devices" finish.
I've tried to update the driver, but I can't find any driver for "Generic USB hub"
Anyone have a solution to this problem? I really don't want to reinstall Windows, but I might have to do it unless I find a solution to this problem...

Found the cause of the "Generic USB hub" problem in C:\Windows\INF\setupapi.dev.log.
In that file it's clear that the problem stems from the fact that usb.inf is missing...
Now I've got to figure out how to get a working usb.inf without reinstalling the whole OS

Network Problems with LaCie Firewire or USB Hub

Hi Folks,
I have a recurring problem with my 27-Inch iMac mid-2010 running OSX 10.7.2 (had same problem with Snow Leopard before upgrading) where, when a Firewire device ( LA Cie HD) or a USB Hub is pluged-in the wired ethernet will not work on wake up from sleep.
I always have to cycle off my Cisco Router for the Mac to use the wired ethernet.
Does not happen with the WIFI and does not happen if there is no firewire device or USB hub pluged in.
Anyone seen this before? Anyone with an idea on how to resolve this?
Thanks in advance for your thoughts
Dan

I picked up a 2big network a few days ago (to replace two Buffalo LinkStation Pros) and also have not been able to get an icon for the drive to appear on my mac desktop, despite being able to access the 2big through "Connect to Server." I hope to learn more from LaCie.
A successful workaround I'm using is to put the contents of each share on the 2big drive into a single folder in the share, make an alias of the folder in the share, and drag/copy the alias to the desktop of any machine needing access to the share. Admittedly a little kludgy, but easy to disseminate once set up. The desktop alias calls up the respective folder quite crisply, tested now for several machines on the network -- at least with up to ~40 Gb in a given folder/share so far. For reference, this network currently has 6 Mac and 3 Win XP nodes.

Problem with Time Capsule recognizing three USB hub hard drives at one time

I attached three external drives to my Time Capsule using a USB hub, but it only wants to recognize one drive at a time. I know that all three work individually with Time Capsule and the USB hub, because when I turn off the two other drives the third appears. I can turn these on and off sequentially, and all are individually recognized, but only one at a time. Does anyone know what I would need to do to get Time Capsule to recognize all three drives running simultaneously on the network? I turned Time Capsule on and off, to see if it would then recognize the three drives, but it didn't help. Could the hub be the problem, that it is underpowered? I do have an AC adapter on it. Any help would be appreciated.

I have the same issue and would love to know if you resolved it with a powered USB hub. Otherwise, i may just return to one external hard drive--though I will miss the double-backup idea. Anyone try the hub change?

MSI A55M-E33 problems with USB Hub

When I boot with my USB Hub plugged in the screen will stay black and I get a 9C, 99, 92 or A2 error. Often after a few seconds this will disappear but sometimes it will just hang on 9C forever. Without the USB Hub plugged in it will boot straight into windows with no errors, but the internal buzzer will give one long beep and two short beeps.
I used MSI live update 6 to upgrade my BIOS from W10 to W50. Inside the BIOS screen it is given as E7721AMS v32.5.
The boot mode is Legacy + UEFI, and the boot order is:
Boot 1: SSD (win 8.1 64 bit on here)
2: DVD
3: UEFI Hard Disk
4: UEFI USB CD
5: UEFI USB key
etc
My 2nd hard drive isn't listed as an option, though in another section of the BIOS (can't recall which) it is listed as being in a SATA port.
USB devices are a wifi dongle, wireless keyboard & mouse receiver, and a D-Link DUB-H7 7 port usb hub (with 2 external hard drives attached).
Any ideas what I can do? Would a different usb hub solve the problem?

So I phoned a local computer repair shop, and he said it sounded like a faulty USB hub. He advised me to buy a PCI-E usb card and plug the devices directly into that. I was confident he wasn't trying to just sell me anything, as he didn't have these cards in stock and suggested buying one online.
So I bought one of those cards and plugged the external HDD's directly into that. It has solved the problem with hanging on 9C (the beeping problem seems to have just disappeared by itself). Now I just momentarily get a 99 and A2 error then it boots directly into windows 8. Unfortunately the external drives won't appear for about 30 seconds, and also I can't use my wireless keyboard or mouse for the same amount of time.
I'm fairly sure its not the fault of the drives. Today I've plugged them into two windows 7 laptops and booted those and the drives show up immediately. Same with the USB hub.
Does it sound like a faulty motherboard? Or something not set correctly in the BIOS?

Problem with USB hub on network

I recently added a USB hub to my mac mini server, which has the harddrives plugged in. Its a powered hub and within the confines of the mini is perfect.
However on the network I can see my mini, home folder and public folder, but cannot see the harddrives connected to the hub.
Is this a 'feature?'

prabalkmitra wrote:
Whats the model no of that hub??
HI,
I knew you were going to ask that...
The only Information on the Hub is Logitech Premium 4 Port USB Hub (2.0)
And of course I no longer have the packaging...
Picked it up last year at a Local Electronics Store for about $30...
HTH

Boot problems with Belkin USB hub

I can boot to my internal drive with the Belkin 7-port hub connected. But I can't boot to the System Start-Up Disk or to my external with the hub connected. And once I try, I can no longer boot to the internal until I disconnect the Belkin hub.
I have heard their may be hub problems with the MBP and also with the Belkin hub. Any insight would be appreciated.

These are interesting problems. I have a Belkin hub and have been having long boot times (sometimes 5 or 6 minutes) with a blank blue screen for most of the time. I get partial relief by disonnecting the hub. I also have an SD card reader attached to the hub (Memorex brand), so I'm going to try disconnecting that to see if it helps. One noteworthy thing is that these problems are new, whereas the Belkin hub and the Memorex SD card reader have been attached to my MBP for a long time.

USB Hub does not work

I recently purchased this USB hub.
http://www.jascoproducts.com/products/pc/viewPrd.asp?idproduct=8&idcategory=13
My laptop cooler is able to be power through the USB hub.
However, my mouse, keyboard, and external harddrives are not working. For instance, the laser on the optical mouse is not even lighting up.
My mouse, Keyboard, and external hard drive works fine when it is connected directly to the USB pots on my macbook Pro.
Is this a compatibility issue? I mean, GE says that the hub works with mac os. And for a generic hub like this, there shouldn't be any issues right?
Message was edited by: wlfpck

Hi wifpck;
The first problem I see with this hub is that it is USB 1.1 which is a very slow out of date protocol.
Secondly it doesn't appear to be a powered hub. Hence all of the power for the hub must come from the USB on your Mac. Powering laptop cooler maybe over loading the USB port. I would suggest that you try it without the laptop cooler connected and see if works better that way.
Allan

USB hub does not work with iTunes

I have been trying to add USB ports to may Mac's and am not able to synch through the hub. They are hi speed 2.0 USB hubs by Rocketfish and Belkin. iTunes locks up until I remove them from the USB cable (spinning color wheel) and then iTunes goes back to normal. I have tried with both my 24" Intel iMac (Metal one) and a new 15" Macbook Pro. When I use the USB port on the Mac iTunes works great. There seem to be a ton of USB problems posted and zero answers on how to correct. I have tried with an Color iPOD, iPhone and an iTouch to no avail. Having a couple of USB ports won't work in my situation. Anyone know if Apple has posted a workaround or a real fix anywhere.

Thanks, I missed where I posted But I tried with my HP - Same issue. I think others have had this. I believe that iTunes is hit or miss on Hubs. I wish I could figure out what makes them a hit - instead of a miss.

USB hub does not work! Help

I was attempting to install a KVM switch for my G4 and G5 that required me attaching my keyboard and mouse to the usb port on the back of the monitor.
The USB hub does not work! Monitor cable has no bent pins, and works perfectly for video with all my Mac's, G4's, G5's. The problem is I have had this monitor awhile and never tried these ports so apple won't help.
Anyone have any suggestions why these ports don't work and if there is a fix?
Can any one recommend a KVM switch that supports ADC, and USB so I bypass this hub.
Thanks

Some USB 2.0 hardware works very well w/USB 3.0 & some don't. Suggest that you contact the sound card manufacturer & ask them. Perhaps they can recommend a work-a-round.
Another user posted about the same problem some weeks ago regarding a sound card.

USB Hub problem?

Similar Messages

Maybe you are looking for