13 results about "Flying height" patented technology

A Data Storage Device (DSD) comprises a magnetic disk and a slider including a writer configured to magnetically write data on the magnetic disk. A voltage is applied to the slider to provide a target offset voltage between the slider and the magnetic disk with the applied voltage differing from a disk voltage of the magnetic disk. In one aspect, a first disk voltage is determined for the magnetic disk. The voltage to be applied to the slider is determined to adjust an electric potential difference between the slider and the disk to the non-zero target offset voltage. In another aspect, the voltage applied to the slider is less than the disk voltage and reduces deterioration of the slider caused by operation of an energy-assisted magnetic recording technology at the slider while maintaining a safe fly height of the slider over the magnetic disk.

According to an embodiment, a biasing circuit includes a high impedance bias stage coupled to sensor pads connected to a resistive sensor for detecting fly height in a hard disk drive. The circuit employs dual operational transconductance amplifiers with different bandwidths working in conjunction with switching circuitry to establish and maintain bias conditions. A first operational transconductance amplifier with a higher bandwidth provides fast initial settling, while a second operational transconductance amplifier with a lower bandwidth optimizes continuous operation. The architecture supports multiple operating modes, including differential voltage, differential current, and common mode configurations, through various arrangements of transistors, compensation capacitors, and feedback paths.

To provide a magnetic recording head, a design method thereof, and a magnetic recording device that provide thermally activated protection against media damage during dynamic events such as operational shocks, load / unload processes, and emergency power-off.SOLUTION: A perpendicular magnetic recording (PMR) read / write transducer head for heat-assisted magnetic recording (HAMR) includes active nano bumper pads formed from thermally activated dynamic flying height (DFH) bulges that protrude closely on either side of the read / write element, and these bumper pads, which can be multiple, are arranged around the perimeter of he transducer head to absorb the heat generated by active heating element, including the write current. When this energy is absorbed, the bulges expand and change shape, protruding closely outward from the slider air bearing surface (ABS), protecting the read / write head from intentional and unintentional touchdowns.SELECTED DRAWING: None

To provide a disk device suitable for appropriately controlling a floating amount of a head from a disk medium, and a control method for the disk device.SOLUTION: According to one embodiment, a disk device having a disk medium, a head, and a controller is provided. The disk medium has a recording surface. The head has a first read element and a heater. The first read element faces the recording surface. The controller detects a first noise at heating the head corresponding to a signal read from the disk medium by the first read element when power is started to be supplied to the heater.SELECTED DRAWING: Figure 1

The embodiment of the invention provides a storage device, a tape memory and a storage system, and belongs to the technical field of storage, two sides of a magnetic head of the storage device are provided with cutting edges, the cutting edges can scrape air moving along with a data tape in a read-write state, a low-pressure area is formed between the data tape and the magnetic head to enable the data tape to be close to the magnetic head, and low flying height is achieved. And the read-write efficiency and the read-write precision are improved. The adjusting structures are arranged on the two sides of the magnetic head, each adjusting structure is provided with an arc-shaped face protruding towards the data band, when the data band moves, air is brought into the space between the data band and the adjusting structures to form a gas interval, gas in the gas interval generates a positive pressure effect to support the data band, and the envelope angle and acting force between the data band and the magnetic head are adjusted. The envelope angle and the acting force between the data tape and the magnetic head can be adjusted in a self-adaptive mode through the adjusting structure, it can be guaranteed that low flight height and high read-write efficiency and precision are achieved in the read-write state, the acting force between the data tape and the magnetic head can be reduced in the tape rewinding state, and abrasion between the data tape and the magnetic head is relieved.

The invention relates to a magnetic disk device and a method for adjusting head flight height in the magnetic disk device. According to an embodiment, a method of adjusting a head flight height in a magnetic disk device including a magnetic disk, a head to write or read data along a track of the magnetic disk, and a heater disposed near the head includes: determining a threshold value of the head flight height; calculating statistics according to the data of the flight height of the magnetic head according to the time sequence; and if the statistical magnitude exceeds a threshold value, adjusting the flight height of the magnetic head.

According to an embodiment, a circuit includes a core and low-frequency recovery circuits. The core circuit is configured to bias a resistive sensor used to measure a fly height of a hard disk drive. The core circuit is additionally configured to amplify a high-frequency component of a sensing signal of the resistive sensor, the sensing signal indicating the fly height. The low-frequency recovery circuit is configured to amplify the sensing signal's low-frequency component.

According to an embodiment, the method for adjusting a head flying height in a magnetic disk device including a disk, a head that writes or reads data along tracks of the disk, and a heater provided near the head includes: determining a threshold of the head flying height; calculating a statistic from the chronological data of the head flying height; and adjusting the head flying height if the statistic exceeds the threshold.

Methods and apparatus to identify a substrate suitable for configuring a magnetic media of a data storage device for magnetic recording are described. In one aspect, the method includes determining a roll-off value, a slip-jump value, and a radial waviness value, each associated with an outer diameter (OD) edge region of a data surface of the substrate, and determining a calculated minimum flight height between a slider of the data storage device and a data surface of the substrate in the OD edge region based on the roll-off value, the ski-jump value, and the radial waviness value. The method further includes comparing the calculated minimum flight height to a flight height threshold and determining whether to use the substrate for the magnetic medium based on the comparison of the calculated minimum flight height to the flight height threshold.

According to an embodiment, the method for adjusting a head flying height in a magnetic disk device including a disk, a head that writes or reads data along tracks of the disk, and a heater provided near the head includes: determining a threshold of the head flying height; calculating a statistic from the chronological data of the head flying height; and adjusting the head flying height if the statistic exceeds the threshold.

To provide a method for adjusting a head floating amount in a magnetic disk device capable of evaluating magnitude of variations of the floating amount and quickly adjusting the floating amount.SOLUTION: A method for adjusting a head floating amount of an embodiment is a method for adjusting a head floating amount in a magnetic disk device having a disk, a head that writes or reads data along a track on the disk, and a heater provided near the head, wherein a threshold value for the head floating amount is determined, a statistical amount for evaluating variations of time-series data of the head floating amount is calculated from the time-series data of the head floating amount, and the head floating amount is adjusted when the statistical amount exceeds the threshold value.SELECTED DRAWING: Figure 1

The invention relates to the technical field of computer storage and fault prediction and health management, and discloses a dynamic bad track prediction and self-repairing method for a storage hard disk, which comprises the following steps: acquiring multi-source underlying physical sensing signals such as read-write error rate, servo offset, magnetic head flight height and the like; constructing a health state evaluation matrix of the logic block address index; performing spatial neighborhood extension marking on the historical bad track to form a high-risk region; identifying early warning blocks with high-risk scores and adjacent bad track features; migrating the data to a healthy target block and updating metadata to realize logic shielding; and the shielding block is continuously monitored and is recovered to be available after reaching the standard. The system comprises a signal acquisition module, a health assessment module, a high-risk marking module, an early warning identification module, a data migration module, a metadata updating module and an observation queue management module. Through multi-dimensional sensing fusion and a dynamic remapping mechanism, early prediction, active avoidance and closed-loop self-repairing of the bad track are realized, the reliability of the hard disk is remarkably improved, and the service life of the hard disk is remarkably prolonged.

A method of manufacturing hard disk drives (HDDs) includes assembling a first HDD including a first slider having a first air bearing surface (ABS) configuration, configuring the first HDD to rotate its disk media at a first revolutions-per-minute (RPM), and sealing the first HDD with a first internal pressure level. Continuing, the method includes assembling a second HDD including a second head slider having the same first ABS configuration, configuring the second HDD to rotate its disk media at a second RPM that is lower than the first RPM, and sealing the second HDD with a second internal pressure level that is higher than the first pressure level. Thus, in the context of using a common slider among different RPM drives, a higher internal pressure for the lower RPM drive can compensate for loss in fly height that might otherwise occur due to the lower operational RPM.