11 Nov
2007
11 Nov
'07
7:51 a.m.
On Fri, 9 Nov 2007, Jules Richardson wrote:
> Exactly the same with my drive. Cleaning the top magnet wasn't so bad as
> I could take it to the sink to do it and really work at it, but I
> couldn't do much for the lower one - and obviously removing the whole
> head assembly is a bad idea ;)
Many hard drives allows you to swing the bottom magnet out without
moving the arm like Fujistu, Conner design of chassis. For ones you
need some kind of tool to gently ramp heads off the platters and
unbolted.
Somewhat OT but on topic about crumbling rare earth magnets:
While on the bursting rare earth magnets, I have got a set (under 3
years old) with a color wheel one of magnetic bearing suspension
went powdery (burst the plated protective shell) and gummed up the
works rendering the DLP's color wheel useless (siezed). Costs
between 150-180 for a colorwheel and labor not included. OUCH!
Makers of DLP sets went to ceramic air bearing instead for color
wheels. And can be installed in older ones and change a jumper and a
twreak to the color wheel index timing in some makes. Color wheels
is is 6 to 7 segments made of seperate pieces of thin optical glass
and plated with different colors (two sets of red, green and blue
usually) clamped to the aluminum/brass hub. Had to be precise made
and balanced to archive 9,000+ rpm and make little noise as possible.
Cheers, Wizard