🚀 go-pugleaf

Phred <ppnerkDELETETHIS@yahoo.com> wrote
in message news:2kilf9F2jnpjU2@uni-berlin.de...
> Rod Speed <rod_speed@yahoo.com> wrote
>> Phred <ppnerkDELETETHIS@yahoo.com> wrote
>>> 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.

> And you reckon *I'm* a tad radical!  8-)

That aint radical, stupid |-(

> Incidentally, does the SATA spec make
> such things simpler than the  older ATA?

Yep, it allows for hot plugging in the formal standard.

ATA never has.