Automatic Scratch Detector for Magnetic Disk
doi: 10.14456/mijet.2021.13
Keywords:
light reflection, scratch detection, magnetic diskAbstract
The development of an automatic scratch detector for a magnetic disk aims to detect scratches on magnetic disk surface at the micrometer level. In hard disk manufacturing industry, it is vital to focus on hard disk quality checking. [Every piece is scrutinized, especially a magnetic disk inspected for scratches. They are occurred during industrial manufacturing processes and by read/write head devices. It may affect data storage performance of magnetic disk.] In this study, scratch detector is operated by reflective method, using the principle of laser reflection (Laser). The beam is sent to disk surface and reflected to photo diode, which is a light receiver. It is found that when the intensity of laser beam received by photo diode reflect on scratched and non-scratched area differently. Light intensity is decreased when it reflects on scratched area. The signal amplitude is between 2.1 - 4.3 volts. It is indicated that the magnetic disk surface is scratched. Finally, it revealed that width of scratch magnetic disk measured by Stereo Microscope (SM) was 30 micrometers in a micrometer scale.
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