🚀 go-pugleaf

Phred <ppnerkDELETETHIS@yahoo.com> wrote
in message news:2kfvk2F1kfedU2@uni-berlin.de...
> Rod Speed <rod_speed@yahoo.com> wrote
>> Phred <ppnerkDELETETHIS@yahoo.com> wrote
>>> Timothy Daniels <TDaniels@NoSpamDot.com> wrote
> >>> CJT wrote

>>>>> Who knows what state they're in when they're unpowered?
>>>>    1)  Is there a "state" when the circuits are unpowered?
>>>>    2)  How is the "state" of an unpowered circuit going to
>>>>         affect the signal passing by?

>>> Going back a few years, ISTR that the manual for the TRS-80 Model
>>> I stated that peripherals should all be powered up before (or at least
>>> simultaneously with) the computer to avoid damage to unpowered circuits.

>> It was always much more complicated than that.

> It always is.  :-)

You're getting there, grasshopper |-)

>> RS232 was designed right from the start to not only
>> handle that fine, but to hand shorts in the cable fine too.
>> In spades with USB and firewire now too.

>>> Don't ask me why this was recommended; but I *assumed* it
>>> had something to do with signal current paths that were perhaps
>>> "open" when they shouldn't have been, and thus more susceptible.

>> To some extent. Not relevant now tho.

> Getting back to the OP's original question then,

Tad radical.

> I assume you're happy to have a 2nd HDD unpowered but not unplugged?

Nope, I dont think THAT is a good idea.

It usually does work, but not always, you can see some
problems with the bios working out what drives are present etc.

Thats a different issue to the damage question tho.

> Or, perhaps more to the point for convenience,
> which way would you do it -- disconnect the
> power, or disconnect the interface?  Or both?

I always disconnect both.

And I dont like the major kludge that removable drive bays
involve, I prefer to use a proper formal standard like USB
or firewire or SATA that defines that behaviour fully.