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   MSGID:  ecc1eeb1   
   REPLY:  cf743acb   
   PID: SoupGate-Win32 v1.05   
   Michael Schwingen  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.   
   >   
   > So either all USB is blocked, or the USB disk with the root FS stops   
   > responding.   
   >   
   > This might be a power issue.  Mechanical disks pull a lot of power, and   
   > unless it is a 1.8" drive this is often more than the 500mA allowed on   
   > USB2.0 ports.   
   >   
   > Make sure the power supply for the Pi can handle the (peak) load without   
   > voltage drops. Aging power supplies and cables/connectors with bad contact   
   > can cause slowly increasing problems.   
   >   
   > You might try putting a self-powered USB hub (with its own power supply)   
   > between the Pi and the disk and see if that changes anything.   
      
   This is quite possible.  Especially if the widget you plug in has a big   
   decoupling capacitor, it could take a current spike which causes the supply   
   voltage to drop out momentarily and could upset further communications.   
      
   One thing to try would be to put the widget behind a powered hub.  Plug the   
   widget into the hub, make sure the hub power is on, then plug the hub into   
   the Pi.  That way there will be no increased power loading on the Pi as the   
   widget is plugged in.   
      
   Theo   
      
   --- SoupGate-Win32 v1.05   
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