We had CDC drives with similar HDA's which would go bad from time to time. Are you sure it is the HDA bearing and not the main drive motor? The winchesters we had for Fuji had the heads land in a landing zone like the CDC drives did. I never saw a bearing failure (had 2) that didn't clearly take out the media due to chatter or play. You don't give enough to guess at the symptoms here, such as how long it may have run with the bearings defective, were they found to be defective while in operation, or are you doing a restore, and they are damaged / suspect. Hopefully as Tony says, you can find a clean room or make a very clean area. I'm not sure what CDC did to open and repair HDA's. With the heads directly parked on the media, there isn't much room for error getting the thing apart. Moving the voice coil tower with all the heads a slowly and carefully as you will need to will be quite a feat. I think they had jigs and tools to allow that, as well as fixtures to hold the heads apart when assembling them. Not sure about how they pulled them apart when they would dismantle for repair. We did have a few motors go bad, and they were standard enough that a local shop could rebuild the motors, as well as supply the caps for a lot lower cost than CDC. Also CDC used a solid state relay to run the motor, and those we could get thru Grainger cheaper than CDC. The Fujitsu drives would be more of a problem in that area to some degree, since the parts are not that common as to be stocked by local motor referb shops. I hope you are really sure it has to come apart if you had it fail while running, as taking this assembly apart usually gets you a stack of scrap metal. Jim On 10/10/2011 11:26 AM, CRC wrote: