Maximum Number of USB Mass Storage Devices

David King dking at
Fri Feb 19 07:15:19 UTC 2010

> I have a requirement to connect a large number of USB bus powered external
> hard disks to a FreeBSD 8.0 system. I am talking about hundreds of them.

The USB spec itself limits to 127 devices per bus, including hubs (and including the internal hub-like device on many busses). <>

> I am aware of the power and bus limitations and intend to use power hubs and
> multiple server USB ports to overcome this issue. My question is this:
> Does FreeBSD 8.0-RELEASE have an operating system limitation on the number
> of USB storage devices I can connect and mount.
> Thanks.
> Patrick Collins

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