DIY: SPINmaster; a hard disk staggered spin-up system
a DIY experiment: staggered hard drive spin-up via some arduino programming, a ULN2003 relay driver chip, 5 low voltage relays and a ceramic resonator to keep the arduino clocking along ;)
this photo shows that the top 3 leds are in the green (powered up) state and the final one on the bottom is still waiting for his turn to spin-up (turn on the led and latch the relay).
when all 4 relays are latched and the final drive has its time to spin-up, the red led and relay on top (small black relay) go out, letting the pc out of its reset-hold and letting it finally POST.
source code is here: www.netstuff.org/spinmaster/
annotated view: www.flickr.com/photos/linux-works/4322722129/
wiring side view: www.flickr.com/photos/linux-works/4322734097/
new: working version! www.flickr.com/photos/linux-works/4330091417/