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