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Disk Drive Disk Stack Assembly for Reduced Disk Vibration

IP.com Disclosure Number: IPCOM000014720D
Original Publication Date: 2000-Dec-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Abstract

Disclosed is a disk stack assembly design technique to achieve reduced disk vibration. The disclosed design significantly reduces disk flutter vibration in disk drives which is particularly problematic in high performance high RPM disk drives. The disclosed design approach achieves the reduced disk vibration without any development effort in new disk substrate materials. The approach does not require investment in new disk processing tooling which would be requied by new disk geometry (increased thickness or reduced diameter) which is a method that has been used previously in reducing disk flutter vibration. The design approach consists of using two existing standard thickness and standard diameter disks paired back to back where such paired disks become the functional disks in the new disk stack assembly which gives reduced disk vibration. The resulting functional disk thickness is twice that of the original disk thickness. Such singular disks which make up the disk pair can be single sided in terms of disk finishing and thus would be of lower cost than standard disks. When the paired disks are properly aligned using a mandrill on the disks' inner diameters, or some other means, measurements have shown no degradation in disk pair flatness or curvature when clamped in a spindle disk pack assembly.

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Disk Drive Disk Stack Assembly for Reduced Disk Vibration

    Disclosed is a disk stack assembly design technique to achieve reduced disk vibration. The disclosed design significantly reduces disk flutter vibration in disk drives which is particularly problematic in high performance high RPM disk drives. The disclosed design approach achieves the reduced disk vibration without any development effort in new disk substrate materials. The approach does not require investment in new disk processing tooling which would be requied by new disk geometry (increased thickness or reduced diameter) which is a method that has been used previously in reducing disk flutter vibration. The design approach consists of using two existing standard thickness and standard diameter disks paired back to back where such paired disks become the functional disks in the new disk stack assembly which gives reduced disk vibration. The resulting functional disk thickness is twice that of the original disk thickness. Such singular disks which make up the disk pair can be single sided in terms of disk finishing and thus would be of lower cost than standard disks. When the paired disks are properly aligned using a mandrill on the disks' inner diameters, or some other means, measurements have shown no degradation in disk pair flatness or curvature when clamped in a spindle disk pack assembly.

    The improvement in disk drive track following servo performance with this method of reduced disk vibration is better than if a single...