Re: (OT) Storage (8*IDE HDs) any experiences?
On Sun, Apr 29, 2001 at 10:14:35AM +0200, Russell Coker wrote:
> On Sunday 29 April 2001 06:48, Brandon High wrote:
> > On Sat, Apr 28, 2001 at 11:50:26PM +0200, Andreas Bombe wrote:
> > > The IBM SCSI disk I have here has a jumper to delay spin up depending on
> > > SCSI ID so that an array of those would spin up sequentially if they all
> > > had those jumper set (and different IDs, which they need anyway). Maybe
> > > there are IDE drives built with RAIDs in mind offering some similar
> > > option?
> >
> > I doubt it, but with a sufficiently large case (or small power supply) it
> > may be possible to stick a 2nd (or 3rd) power supply in. Drives could be
> > plugged into the second PS while the MB is powered off of the primary PS.
>
> That sounds like a really bad idea to me.
>
> In a regular setup the IDE controller and the drive get power from the same
> source. So if the signals on the cable have more current going one way than
> the other then the difference will be made up on the 0V line on the PSU. If
> you have separate PSU's then the difference will go through other lines of
> the data cable. This is something that is likely to be fatal to drives and
> motherboards.
>
> But if you try it please let me know how it works. ;)
I've used a second power supply just to test out some hard drives, because I
didn't want them to hang off the PS.
It worked great.
Mike
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