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Re: Swapping Drives - Sanity Check




On Sat, Feb 23, 2019 at 09:41:27AM -0500, rhkramer@xxxxxxxxx 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

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