INTL 3:770/1 3:770/3   
   REPLYADDR bp@www.zefox.net   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  18d7ffcb   
   REPLY:  cfc74593   
   PID: SoupGate-Win32 v1.05   
   Chris Schram  wrote:   
   > On 2024-01-07, bob prohaska  wrote:   
   >> From time to time my Pi 4 running   
   >>   
   >> Linux raspberrypi 6.1.21-v8+ #1642 SMP PREEMPT   
   >> Mon Apr  3 17:24:16 BST 2023 aarch64 GNU/Linux   
   >>   
   >> crashes when a USB device is plugged into it.   
   >> The Pi4 boots from a usb3 mechanical disk.   
   >   
   > The operation of the fan tends to build up a static charge throughout   
   > the case's environment. When a USB device is plugged in, there is often   
   > a brief static discharge, which can have an undesirable effect on the   
   > Pi. I might get a screen glitch or a hang or a crash or a reboot,   
   >   
   Maybe. My Pi4 lives in a CanaKit (or similar) case with a little   
   5v fan running on 3.3 volts. There's certainly not enough zap to   
   make a noise, I've not been watching the display at the moment   
   of plug-in.   
      
   > I alleviate this problem by using an old unpowered Radio Shack USB hub.   
   > This minimizes static buildup, and keeps any potential discharge some   
   > distance from the Pi's circuit board.   
   >   
   It also lets the usb subsystem recognize the hub as a separate   
   object, apart from the thing you actually want to connect. I.E.,   
   it enumerates the hub, then enumerates the device. not both at once.   
   Dunno if that matters, but I'd think not.   
      
   You've raised an interesting point. I've noticed that if I put a   
   microSD card in a USB adapter and plug it into the pi, the pi   
   crashes. If I plug the adapter into the Pi and then plug the   
   card into the adapter, it works fine. Hubs are not the same as   
   adapters, but there's a whiff of similarity.   
      
   Thanks for writing!   
      
   bob prohaska   
      
   --- SoupGate-Win32 v1.05   
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