Le 14/05/2016 07:50, Tim a écrit : > On Fri, 2016-05-13 at 11:12 +0200, François Patte wrote: >> The issue now is about wifi connections and usb (!!) >> >> If I plug an external usb harddrive, the wifi connection becomes >> awfull: > > Important question: Is the USB harddrive externally powered? > > Ed makes the point that the USB host may not handle powering the drive > and the WiFi, very well, simultaneously. > > I'll make the point that some externally power supplies are absolutely > terrible, they can radiate a massive amount of electromagnetic > interference. > > I've had a couple that could knock an ADSL modem off-line if I plugged > them into a computer, anywhere on the network, even in a different room. > The drive just had to be connected, the system it was plugged into could > be completely powered off. It just spewed crap everywhere. The modem > would die off and stay unworkable. > I use both: HDD are not powered, but I sometimes use a hub to plug several HDD and the hub can be powered. But with or without external power supply, nothing changes! -- François Patte UFR de mathématiques et informatique Laboratoire CNRS MAP5, UMR 8145 Université Paris Descartes 45, rue des Saints Pères F-75270 Paris Cedex 06 Tél. +33 (0)1 8394 5849 http://www.math-info.univ-paris5.fr/~patte
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