>> Before there where capsulated 'Winchester' type drives
>> mainframes relied on removable disk stacks wit technology
>> #1. Of course these had air filtration etc., but the stacks
> Are you sure? On _all_ the demountable drives I have here (DEC and CDC),
> the heads fly over the disk surface. They are not at a mechanically fixed
> height, like on a drum. In other words, they are like #2, not #1.
> I would be _very_ suprised if you could make a demountable drive where
> you could remove the platter and put it back and get the position right
> to 100 microns or so. That's why the head position has to be set by the
> platter - i.e. the heads fly.
I cant speak for any drive, but some 19 years back (1979)
I've been working as a field technican for SIEMENS mainframe
computers and head adjustment has been one of the most complex
issues. Althrough air flow had influence, the main adjustment
was done by *hard*ware. No way a fixed mounted head on a
thight fited mounting could move seperatly ... and the fingers
and mountings had a weight of several kilogramms :)
Servus
Hans
--
Ich denke, also bin ich, also gut
HRK
Received on Fri Nov 13 1998 - 19:12:29 GMT