Spindle Tilt Reduction in Disk File
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
In a disk file with stacked multiple heads serving a disk stack mounted on a spindle, any tilt in that spindle means that some of the heads will be offset from their respective tracks on the disks causing data errors. To overcome this, the spindle is supported at each end by flanges, each of which may be heated to increase its length. The offset of each head is measured with respect to servo information on the corresponding disk, and averaged out to decide which of the two flange heaters should be driven via a feedback loop to give tilt correction. The figure shows a spindle, each end of which is mounted on a flange separated from the main body of the disk enclosure. The flanges are heated by small heaters. One heater or the other is used depending on the correction required.