A hard-disk drive (HDD) is a non-volatile storage device that is housed in a protective enclosure and stores digitally encoded data on one or more circular disk having magnetic surfaces. When an HDD is in operation, each magnetic-recording disk is rapidly rotated by a spindle system. Data is read from and written to a magnetic-recording disk using a read/write head that is positioned over a specific location of a disk by an actuator. A read/write head uses a magnetic field to read data from and write data to the surface of a magnetic-recording disk. A write head makes use of the electricity flowing through a coil, which produces a magnetic field. Electrical pulses are sent to the write head, with different patterns of positive and negative currents. The current in the coil of the head induces a magnetic field across the gap between the head and the magnetic disk, which in turn magnetizes a small area on the recording medium.
Many HDDs are configured to include a ramp (also referred to as a load/unload ramp). Ramp load/unload technology involves a mechanism that moves the head stack assembly (HSA), including the sliders, away from and off the disks and safely positions them onto a cam-like structure. The cam typically includes a shallow ramp on the side closest to the disk. During a power-on sequence, for example, the read/write heads are loaded by moving the sliders off the ramp and over the disk surfaces when the disks reach the appropriate rotational speed. Thus, the terminology used is that the sliders or HSA are “loaded” to or over the disk (i.e., off the ramp) into an operational position, and “unloaded” from the disk (i.e., “parked” onto the ramp) such as in an idle position.
Furthermore, many HDDs are configured with a latch mechanism to secure the HSA, or at least the suspension/slider portion of the HSA, on the ramp (or perhaps on a landing zone of the disk for HDD's absent a ramp) when not operating. Thus, the head slider is prevented from dislodging from the ramp and moving over the disk when the actuator rotates due to external vibration or shock events. In light of the customer demand and industry move toward thinner and thinner HDD's, internal space constraints present challenges for sub-system design and development.
Any approaches described in this section are approaches that could be pursued, but not necessarily approaches that have been previously conceived or pursued. Therefore, unless otherwise indicated, it should not be assumed that any of the approaches described in this section qualify as prior art merely by virtue of their inclusion in this section.