Wondering si I can connect more than two usb devices.
It depends on the power capability of the EA7400! Usually, those ports are rated at 500ma, or 0.5 amps each. If you plug in a non-powered hub into one of the ports, it will draw power from the EA7400 to operate. If the power draw needed exceeds the capability of the port, it won't work properly. A powered hub relies on an external power source. In that case, only data collisions (oversaturating the ports) need to be considered.
SOURCE: D-Link DUB-C2 does not recognize external storage device
Download the latest drivers and firware for the card.
SOURCE: USB Port won't recognize plug n Play devices
do you have the upgrade for your O/S to recognize usb 2 as sometimes when first plugged in a usb device my computer has come up with your usb is 1.1 you need to upgrade to sp2 or whatever to have usb2
SOURCE: power surge on hub port a usb device has exceeded
I don't know how old your system might be or how many USB controllers it has on the motherboard, but understand this...
Theoretically, one USB port can support up to 999 "daisy chained" devices.
With that said...the way a USB port is implemented on a motherboard,
manufacturers enable two or four ports to be working off of one USB
interface. Those ports you see on the front of your computer are most
likely connected to just one USB interface on the actual motherboard
and that's why you always see computers with USB ports located together
in pairs.
With that in mind, you're USB ports are connected to what is referred
to as a "hub"(that motherboard interface), which only outputs so much
power. If one device or many devices attached to this "hub" exceed the
power output of this "hub" then it will either back down to USB 1.1
speeds or it won't function at all. That is why some USB accessories
require their own wall adapter, because the USB can't supply all the
necessary power for it.
So one of two things has happened, either your USB port is fried or you introduced a new USB item to the "hub"
that surpasses the power requirements of what your USB hub can output
once you plug in your mp3 player.
You can troubleshoot by unplugging all un-necessary USB
equipment and try only that port again. My assumption is that the USB hub is fine but
the actual usb port you use might be damaged.
Good luck.
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