| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 360025000 | CHECKING RECORD CHARACTERISTICS OR MODIFYING RECORDING SIGNAL FOR CHARACTERISTIC COMPENSATION | 8 |
| 20080239534 | Encryption methods for patterned media watermarking - Watermarks for patterned magnetic media. The watermarks are used to demonstrate the unauthorized replication of a patterned magnetic media. The watermarks include a dibit, a pattern in an open region, shifting of data, shifting of a sync mark and large length scale perturbations. Also described are methods to determine if a watermark appears on a patterned media. | 10-02-2008 |
| 20080259480 | Glide test and calibration using flying height on demand - A glide head that can be used to certify disks of hard disk drives. The glide head includes a heater that can change the temperature of a slider surface of the head and vary the head flying height. The slider surface may induce the negative pressure so that the glide head more accurately simulates a head used in a production disk drive. A piezoelectric transducer may be coupled to the glide head so that contact between the head and a disk may be sensed and recorded in a disk certification routine. | 10-23-2008 |
| 20090168212 | Dynamic test glide head calibration using laser adjustment - Methods and apparatus for the calibration and use of test glide head gimbal assemblies are disclosed. Calibration is performed by pulse laser adjustment of the flexure mounted to the glide head, while the head is flying above a media test disk having asperities of known dimensions. The calibration process normalizes the fly heights of glide heads used to measure defects on both upper and lower surfaces of disk drive media, allowing upper and lower surfaces to be scanned simultaneously. | 07-02-2009 |
| 20090244750 | MAGNETIC-RECORDING-MEDIUM TESTING APPARATUS, MAGNETIC-RECORDING-MEDIUM TESTING METHOD, AND MAGNETIC RECORDING APPARATUS - A magnetic-recording-medium testing apparatus includes a frequency-characteristic analyzing unit that analyzes a frequency characteristic of a reproduced signal in an area of a magnetic material where a continuous frequency signal is written, in a magnetic recording medium that records a signal according to a magnetization direction of the magnetic material, a signal-amplitude comparing unit that compares signal amplitudes of a fundamental wave and a higher harmonic wave with each other based on the frequency characteristic analyzed by the frequency-characteristic analyzing unit, to estimate a cross sectional shape pattern of the magnetic recording medium, and a performance-quality determining unit that determines performance quality of the magnetic recording medium based on the cross sectional shape pattern of the magnetic recording medium estimated by the signal-amplitude comparing unit. | 10-01-2009 |
| 20090316287 | METHOD AND SYSTEM FOR WRITING INFORMATION TO A TAPE CARTRIDGE - A tape drive system for a tape cartridge including a tape and wireless identification tag may read information from the wireless identification tag and write the information to the tape. The tape drive system may toggle a bit stored on the wireless identification tag to indicate that the information has been written to the tape. The information may include tape initialization information. | 12-24-2009 |
| 20110141597 | TAPE LIBRARY SYSTEM AND METHOD OF DIAGNOSING TAPE CARTRIDGES - A tape library system includes a plurality of cartridge cells for accommodating a plurality of tape cartridges respectively, a tape drive for writing and reading data to and from the tape cartridge inserted therein, a diagnosis drive for diagnosing the tape cartridge inserted therein, an cartridge carriage mechanism for inserting and ejecting the tape cartridge into and from the tape drive and the diagnosis drive, and a diagnosis controller for controlling the cartridge carriage mechanism to load the tape cartridge into the diagnosis drive and for controlling the diagnosis drive to diagnose the tape cartridge inserted therein. | 06-16-2011 |
| 20110141598 | DISK SURFACE DEFECT INSPECTION METHOD AND APPARATUS - There is provided a detect inspection method and apparatus capable of performing a quick process of determining whether defects on a disk form an annular scratch defect or an island defect, by detecting an annular scratch defect in sum track areas with a deviation exceeding the standard deviation of an amount of defects detected in radius, in the histogram data containing the number of defects in radius, or by detecting an island defect in sum angle areas with a deviation exceeding the standard deviation of an amount of defects detected in angle, in the histogram data containing the number of defects in angle. Thus, the defect detection process can be performed step by step, by separating the annular scratch defect or the island defect from the other detects. As a result, a process load on the data processor can be reduced even if the number of detected defects increases. | 06-16-2011 |
| 20160005423 | DATA MANAGEMENT FOR A DATA STORAGE DEVICE WITH ZONE RELOCATION - Managing data stored on media of a Data Storage Device (DSD) using zone relocation. At least a portion of the media is logically divided into a plurality of zones and zones are identified with access counts greater than or equal to a threshold. The access count for each of the identified zones indicates a number of times data in the zone has been read or written. Data is relocated from at least one zone of the identified zones to at least one destination zone on the media to reduce a data access time between the identified zones. | 01-07-2016 |
