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Apparatus to Limit Disk Pack Rotation During Shipping and Handling Disclosure Number: IPCOM000014265D
Original Publication Date: 1999-Dec-01
Included in the Prior Art Database: 2003-Jun-19

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Greg Frees


Published is an apparatus to limit disk pack rotation in a disk drive during shipping and handling. Unwanted rotation of the disk pack during shipping and handling can result in damage to the ball bearings in the spindle. Damaged spindle bearings can result in increased track-misregistration (TMR) which can reduce data reliability and input/output (I/O) performance of the drive, increased acoustics from the drive, and decreased life/reliability of the spindle. The disk pack can rotate on the spindle bearings during shipping and handling because of vibrations and accelerations that are imposed on the disk drive. In particular, the disk pack is relatively free to rotate in cases where the read-write heads/sliders are removed from the disk surfaces during non-operation (as is the case in some disk drives today). Normally the sliders provide a friction force that acts to restrain the pack if they are in contact with the disks during non-operation. It is therefore desirable to provide an apparatus to eliminate disk pack rotation in cases where there is not enough natural friction to restrain it during normal non-operational handling. Fig.1 Fig. 2