Problems with identical USB 2.0 devices

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Guest

I need to copy (professionally) memory cards. (Sony duo cards)
So I need to connect at least 5 usb card readers.
As I bought the same readers, most of the time when I connect them I will
get a blue screen after connecting the third or fourth reader and windows
shuts down and restarts.
Theorethecal it should be possible to connect 127 USB devices on 1 USB port.
Does anyone know How I can solve my problems?
Many thanks in advance.
 
Have you tried to connect them all at once, and then starting your machine
up. Well that would be if you have enough usb ports. Otherwise if you are
removing and reinserting the others, you would need to shut the one down
before removal. And only after this insert the next one.
 
I have tried to connect them all at once and I have tried them one by one,
everytime the same problem. And it is logical because every reader has a
identity-key and because the readers are the same, the keys are the same and
Windows probably can not handle this.
--
Kind regards,
Fred P


Gee said:
Have you tried to connect them all at once, and then starting your machine
up. Well that would be if you have enough usb ports. Otherwise if you are
removing and reinserting the others, you would need to shut the one down
before removal. And only after this insert the next one.
Click to expand...
 
Fred P said:
I have tried to connect them all at once and I have tried them one by one,
everytime the same problem. And it is logical because every reader has a
identity-key and because the readers are the same, the keys are the same
and
Windows probably can not handle this.
Click to expand...

Two things come to mind, first, yes, you might want to trick WIndows about
identical devices by putting them on different USB ports. They may simply
not be made for this scenario. This kind of problem arose at one time
using multiple identical modems on Windows; IIRC .inf file changes were
necessary to make Windows think the modems were different.

Second, don't draw too much power from USB chains.

What does Sony and the reader manufacturer say about using multiple readers
in this way?

HTH
-pk
 
The USB devices all draw power from the USB ports. If the USB ports can not
provide the complete power requirements, this may cause your problem. In
order to connect 127 devices to a USB ports, you would need to also supply
the extra power that is required. The easiest way to do this is to connect
powered USB hubs (USB hubs that come with their own power supply). Have you
considered trying this???
 
Yes, I have tried using powered USB hubs but that does not make any difference.
Maybe I should try as many different "brands" (manufacturies) as possible.
Perhaps Windows sees the readers then as different.
--
Kind regards,
Fred P


Yves Leclerc said:
The USB devices all draw power from the USB ports. If the USB ports can not
provide the complete power requirements, this may cause your problem. In
order to connect 127 devices to a USB ports, you would need to also supply
the extra power that is required. The easiest way to do this is to connect
powered USB hubs (USB hubs that come with their own power supply). Have you
considered trying this???
Click to expand...
 
If you connect too many USB devices to one port you may be overloading the
port. It can supply only so much current without sustaining damage.

If each device had an external power supply you "should?" be able to daisy
chain (connect) up to 127 devices without problems. Remember, the current to
feed these devices may be going through a "trace" on the motherboard that is
slightly larger than a human hair. It can't carry much!

Try connecting the devices to different ports or get a powered USB 2.0
external hub.


--
Regards,

Richard Urban
Microsoft MVP Windows Shell/User

Quote from: George Ankner
"If you knew as much as you thought you know,
You would realize that you don't know what you thought you knew!"
 
I have used powered USB hubs and I tried a PCI USB 4 port hub as well.
Makes no difference.
--
Kind regards,
Fred P


Richard Urban said:
If you connect too many USB devices to one port you may be overloading the
port. It can supply only so much current without sustaining damage.

If each device had an external power supply you "should?" be able to daisy
chain (connect) up to 127 devices without problems. Remember, the current to
feed these devices may be going through a "trace" on the motherboard that is
slightly larger than a human hair. It can't carry much!

Try connecting the devices to different ports or get a powered USB 2.0
external hub.


--
Regards,

Richard Urban
Microsoft MVP Windows Shell/User

Quote from: George Ankner
"If you knew as much as you thought you know,
You would realize that you don't know what you thought you knew!"
Click to expand...
 
Then I would say that it is the fault of the devices not being individually
identified, as hard drives are. Each hard drive has it's own designator
(I.D.) so that the O/S can differentiate one from one another. Maybe the
manufacturers of the devices you are using have not thought this far in
advance and only expect one device to be used at a time.

--
Regards,

Richard Urban
Microsoft MVP Windows Shell/User

Quote from: George Ankner
"If you knew as much as you thought you know,
You would realize that you don't know what you thought you knew!"

Fred P said:
I have used powered USB hubs and I tried a PCI USB 4 port hub as well.
Makes no difference.
Click to expand...
 
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