ST-506 hard drive emulation

Billy Pettit Billy.Pettit at
Fri Jul 29 19:15:23 CDT 2005

Jules Richardson wrote:

> Because they were never sold presumably, unlike gearbox bearings.
> Presumably there are parts of a hard disk that never left the factory
> except in a complete drive.

Nah, all bearings are standard.


No, not on disk drives.  Some are the standard size, but lubricants,
especially grease, are unique to disk drives.  The grease had a bad habit of
out gassing hydrocarbons, which eventually cover the head and media
surfaces.  Disk drive lubrication became such a science that eventually only
one or two companies would meet the standards.

Bearings also had a bad habit of allowing particles to pass through them and
cause head crashes as flying heights came down.  Bearings then moved to
labyrinth seals.

They look like standard bearings, but they are not.


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