How many USB HID devices can Windows handle at one time ?
don
How many USB HIDdevices .....
Jan 19, 2010
5 Replies
First reply
I don't think there's a specific limit for HID devices in general, there may be some for specific types of devices.
Read the full reply
I don't think there's a specific limit for HID devices in general, there may be some for specific types of devices.
Wouldn't you be better off asking in a Windows news group?
I don't know how many Windows can handle but a single USB bus is limited to 127 less the number of hubs involved. If one assumes 7-port hubs (fairly common) then that would require about 18 hubs to support just over 100 devices. How well Windows would cope polling that many devices is another matter.
Andrew
s
Of course most PCs have multiple independent USB controllers/ busses... The PC I'm working on right now has a dozen, and I could probably add another couple dozen with a combination of PCI and PCIe cards.
Indeed and mine has seven USB controllers in it. So it is possible to add an awful lot of USB HID devices to a single PC! The various host controllers (OHCI, UHCI, EHCI) do offload quite a lot of work from the host but I've no experience of using a really large number of USB devices under Windows to know how that will run.
It would probably be better to ask the original question in a Microsoft newsgroup.
Andrew
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required