[ltp] any successes with 2.5 inch laptop-IDE-drive USB enclosures?

Daniel linux-thinkpad@linux-thinkpad.org
Wed, 2 Apr 2008 16:52:16 +0200


On Thu, Mar 27, 2008 at 02:26:40PM +0100, Tino Keitel wrote:
> AFAIK the limit is per hub, not per port. So as long as both ports are
> on the same hub, you don't get a higher limit.

This is incorrect. Section 7.2.1 of the USB 2.0 standard specifies that a
root port hub or self powered hub must supply 500 mA per port. A battery
powered system may choose to supply only 100 mA per port on a root port
hub.

regards,
Daniel