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The present Hard Disk assembly method uses manual visual inspection. A Laser Doppler Vibrometry (LDV) device is being used in industry to check the surface of HDD drives by measuring the frequency difference between a reference laser beam and a test response beam.
It is extremely accurate and has the ability to find flaws on the surface of HDD media as small as 1 m. However, using LDV results in a lengthy examination process that can take up to 50 seconds to complete for one HDD medium.
It is necessary to purchase numerous LDV systems to work in parallel in order to maximise test throughput. Modern LDV systems, on the other hand, might be more than USD50,000 per unit, minus depreciation and maintenance , making it an expensive alternative.
Global hard disk drive media defect inspection market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
Specifically created for the HDD sector, the Candela optical surface analyzer (OSA) is a multi-channel laser-based flaw inspection device for R&D and process monitoring.
The novel inspection method distinguishes surface flaws on disc substrates and final media, such as particles and scratches, and offers a number of advantages over manual visual examination.
The powerful flaw detection and classification system from the Candela 7100 series is especially made for the substrates and media used in hard disc drives.
For the present defect of interest (DOI) difficulties, a powerful dual-wavelength laser is optimised, and multi-channel scatter detectors offer improved sensitivity for classifying sub-micron pits, bumps, particles, and buried defects on a variety of substrates.
In order to study flaws and determine their fundamental causes, less reliance is needed on equipment and techniques such atomic force, scanning electron, and transmission electron microscopes thanks to the capabilities and stability of the 7100 series defect inspector.
