Browse Prior Art Database

MOVING RAMP SYSTEM FOR HDD LOAD/UNLOAD

IP.com Disclosure Number: IPCOM000013320D
Original Publication Date: 2000-Apr-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 1 page(s) / 27K

Publishing Venue

IBM

Abstract

Described is a system that incorporates a moving head load/unload ramp to improve data reliability in a hard disk drive. Head load/unload is a system designed to lift the recording heads off the disk surfaces in a hard disk drive when the disks are not spinning. The most common implementation of load/unload in today's hard disk drives uses a fixed comb of ramps that is positioned at the outer periphery of the disk stack. When the motor stops, the actuator is pushed outwards so that specially designed hook levers attached to the heads will engage the ramps, thereby lifting the heads off the disks. When the motor starts, the actuator is pushed inward so that these levers slide down the ramps and allow the heads to fly freely on the disk surfaces.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 51% of the total text.

Page 1 of 1

MOVING RAMP SYSTEM FOR HDD LOAD/UNLOAD

   Described is a system that incorporates a moving head load/unload ramp to
improve data reliability in a hard disk drive. Head load/unload is a system
designed to lift the recording heads off the disk surfaces in a hard disk drive
when the disks are not spinning. The most common implementation of load/unload
in today's hard disk drives uses a fixed comb of ramps that is positioned at the
outer periphery of the disk stack. When the motor stops, the actuator is pushed
outwards so that specially designed hook levers attached to the heads will engage
the ramps, thereby lifting the heads off the disks. When the motor starts, the
actuator is pushed inward so that these levers slide down the ramps and allow the
heads to fly freely on the disk surfaces.

   The head load/unload system has numerous reliability advantages over the older
contact start/stop system, where heads actually land on the disk surface when the
motor stops. Tribological problems such as stiction, durability and fragility are
eliminated by head load/unload. For this reason load/unload has been rapidly
growing in popularity as a design feature among all market segments of hard disk
drives.

   The current implementation of head load/unload does contain some risks,
however. With today's fixed-comb design it is imperative to have tight control
over the velocity of the actuator at all times. During the head loading and
unloading events, if the actuator is moving too fast, the corners of the heads
will contact and damage the disks, including possibly the area where customer
magnetic data
is stored. On the other hand, if the...