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
