Old, but not "Classic"

From: Allison J Parent <allisonp_at_world.std.com>
Date: Thu Nov 12 21:25:20 1998

< Yes, but in a desktop machine, power is not exactly short. In other word
< whether it takes 0.1W or 10W to move the heads is not a major
< consideration. So a jewelled bearing is probably not appropriate here.

That is a consideration! Less power is less heating, less magnetic
fields and higher reliability. Despite desktop power availablity
reducing power in the servo circuit aids minaturization and reliability.

< a meter movement. And secondly they are accurate - the spindle runs true
< but a good metal bush bearing can do that as well. Neither are major
< problems in a desktop servo-tracked disk drive.

The bushed bearing also wears. Jewelled bearings done seem to have the
same wear properties, they are far better.

Allison
Received on Thu Nov 12 1998 - 21:25:20 GMT