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Disk Head Load/Unload Mechanism

IP.com Disclosure Number: IPCOM000040736D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Hatchett, MR Hearn, AR [+details]

Abstract

During operation each head is biased towards a disk surface by its arm and flies close to the surface. During starting and stopping, each head is moved away from its respective disk surface by one finger on a pair of comb structures which move differentially when driven by a shape memory alloy (SMA) spring opposed by a conventional coil spring. When the SMA spring is cold, each pair of fingers associated with a single disk move apart to unload the heads. When the SMA spring is hot, each pair of fingers move together to load the heads. Recent developments in disk file technology have made it necessary to unload the read/write heads during starting and stopping. This is due to the use of thin film disks which creates a stiction/friction problem between the ultra-smooth disk and head.