On Sat, Feb 23, 2019 at 09:41:27AM -0500, rhkramer@gmail.com wrote: > On Saturday, February 23, 2019 07:53:23 AM Pascal Hambourg wrote: > > Le 23/02/2019 à 08:53, David Christensen a écrit : > > > Understand that if you disconnect the power cable to a motherboard, > > > drive, peripheral, etc., but not all the other cables (e.g. SATA cable), > > > you can fry electronics. > > > > Right. This is why power pins are longer than data pins in plug&play > > connectors, so that they are connected first and disconnected last. > > Hmm, that surprises me -- I guess I would have expected that you want the data > pins connected first (while no power is applied), and disconnected last (again, > while no power is applied). Interesting, No. Imagine a data pin at +5V while the power rails are still in an undefined state. Not good for electronics. > I guess I am behind the times (and I will have to find some Plug-n-PLay device > and look at the connectors). Have a look at an USB connector (the traditional one, e.g. Type A): the outer "pins" (rather stripes) are longer (those are 0 and +5V). The middle ones (data) are shorter. Cheers -- t
Attachment:
signature.asc
Description: Digital signature