Various embodiments for audibly mapping computing components in a computer storage system, by a processor device, are provided. In one embodiment, a method comprises creating a detectible audible pattern using an actuator arm and head assembly of a hard disk drive operating in the computer storage system for physically mapping the hard disk drive to a logical location within the computer storage system.

A method comprises sensing for thermal asperities while sequentially scanning a plurality of tracks of a magnetic recording medium in a first direction relative to an inner or outer diameter of the medium. The method comprises halting the scanning at a first track in response to detecting a thermal asperity at the first track, and skipping a predetermined number of tracks in the first direction to a second track. The method also comprises sensing for the thermal asperity while sequentially scanning the plurality of tracks beginning with the second track in a second direction opposite the first direction. The method further comprises halting the scanning at a third track in response to detecting the thermal asperity at the third track, and logging the first and third tracks as tracks between which the thermal asperity is located.

Embodiments of the invention provide a device for measuring pitch and roll torques. The device comprises a sensor plate having a horizontal cross member, a vertical cross member and a surrounding member connecting ends of the horizontal and vertical cross members, wherein the horizontal cross member and the vertical cross member intersect each other at a centre region of the sensor plate; a VCM coil attached to the sensor plate and configured to generate a pitch and a roll torque when an electrical current is applied to the VCM coil; a first strain gauge attached to a surface of the horizontal cross member and configured to detect a horizontal strain caused by the pitch and roll torques; and a second strain gauge attached to a surface of the vertical cross member and configured to detect a vertical strain caused by the pitch and roll torques.

In an embodiment, a testing apparatus includes an air mixing chamber, a docking unit, and a DUT (device under test) test execution unit. The air mixing chamber includes a first air inlet operable to receive a first air flow, a second air inlet operable to receive a second air flow, and an air outlet operable to output a mixed air flow. The docking unit is operable to receive and to securely hold a DUT (device under test) receptacle including an electrical interface, an air flow interface, and a DUT coupled to the electrical interface. The DUT receptacle is configured to enclose and hold inside the DUT. The docking unit is operable to couple to the electrical interface and to the air flow interface. The docking unit is operable to receive and to send the mixed air flow to the DUT receptacle. A DUT test execution unit is coupled to the docking unit. The DUT test execution unit is operable to perform a test on the DUT that is inside of the DUT receptacle.

According to one embodiment, a method of evaluating a scratch mark includes, for a magnetic recording medium including a magnetic recording layer containing magnetic particles and a metal oxide grain boundary provided between the magnetic particles, detecting and evaluating a scratch mark based on information about the reflection intensity of light in a predetermined wavelength range. The predetermined wavelength range includes at least a second wavelength range from 600 nm to 700 nm and a first wavelength range from 300 nm to 500 nm.

Methods are provided for managing defects in Hard Disk Drive (HDD) storage devices. In particular, only a portion of the cylinders of an HDD is tested. Machine learning modeling is used to reconstruct the data for the untested cylinders. An HDD comprises a rotating disk and a read/write head actuated above the disk surface. The disk may be formatted into concentric data tracks, with each track being divided into sectors. The tracks may be organized into zones (groups of tracks called cylinders), and the axially parallel sectors in each cylinder may be organized into wedges. In a test mode, some portion of the cylinders is chosen for testing. Each wedge in the chosen cylinders is tested and labeled defective or non-defective. The test data for each defective wedge is run through a machine learning defect management logic, and inferences are made for the defective/non-defective status of the untested wedges.

According to one embodiment, there is provided a magnetic disk device including a magnetic disk, a magnetic head, and a controller. The magnetic head is opposite the magnetic disk. The magnetic head includes a first read head and a second read head. The controller determines a track pitch in the vicinity of a first track or a second track adjacent to the first track of the magnetic disk based on first position information and second position information. The first position information depends on a servo signal read by the first read head and corresponds to the first track. The second position information depends on a servo signal read by the second read head and corresponds to the second track.

Method and apparatus for managing a data storage system that utilizes heat assisted magnetic recording (HAMR). In some embodiments, the method includes recording data to a storage medium using the HAMR system, accumulating a usage statistic indicative of actual elapsed operation of the HAMR system, and setting an indication value in a memory indicative of an estimate of remaining available elapsed operation of the HAMR system. The estimate of remaining available elapsed operation is determined in relation to the usage statistic and an estimated total elapsed operation value.

An apparatus includes a slider of a magnetic recording transducer comprising a plurality of electrical bond pads. A component is coupled to a pair of the electrical bond pads. A sensor is coupled to the pair of the electrical bond pads in parallel with the component. The sensor is configured to sense for one or more of thermal asperities of a magnetic recording medium, voids of the medium, spacing changes between the slider and the medium, and contact between the slider and the medium. The sensor is configured to be rendered non-functional in response to the sensor receiving a predetermined signal. The component is configured to remain operable after the sensor is rendered non-functional.

A head-disk assembly device, mass spin-valve or gravitational rectifier and method of producing gravitomagnetic induction utilizing Nano-features fabricated on the surface of a hard disk is presented. The Nano-features may include Nano-bumps and Nano-pits. The device includes a computer hard disk, a piezoelectric glide head and/or a GMR read head, a typical hard drive's electronics, wherein defects are fabricated on the said disk using a Focused Ion Beam (FIB) by depositing requisite number of nanobumps of specified height, and etching equal number of nanopits of specified depth a few mils or mm apart on a pre-decided radius. By spinning the said nano-features disk produce (1) an associated mechanical force utilizing a piezoelectric glide head and/or (2) an associated magnetic force utilizing a GMR read head for (a) general use in surface characterization work and (b) for producing power by the presence or the absence of matter on a spinning disk.