From: nospam@needed.invalid   
      
   On Sat, 3/15/2025 4:08 AM, R.Wieser wrote:   
   > Lawrence,   
   >   
   >> Windows doesn't have the idea that any storage device could be   
   >> hot-pluggable, does it.   
   >   
   > Not *any* device, no.  And that has to do with caching as well as   
   > electronics.   
   >   
   > Connecting signal wires before the ground terminal will often cause the   
   > logics attached to it to "see" stuff that isn't there.  Same kind of problem   
   > when the power terminal connects and the device is, electrically,   
   > initializing.   
   >   
   > Regards,   
   > Rudy Wieser   
   >   
   >   
      
   And that's why, if you look at the design of hot-plug devices,   
   you will notice some contacts are longer than others and this   
   is intended to make them "touch first" on insertion.   
      
   As an illustration, the SATA data 7 pin section on the hard drive   
   looks like this. The grounds are longer than the diff pairs for   
   transmit and receive (TX+,TX- and RX+,RX-). When you insert the   
   SATA data connector, the grounds touch first.   
      
            G     G     G   
            G D D G D D G   
      
   On electronics, you can have multiple levels of contact heights,   
   intended to "sequence" the electronics when plugged in.   
      
      Paul   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)