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What are the technical specifications of the Hi-MD disks?

April 26, 2017disks Hi-MD specifications Technical

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What are the technical specifications of the Hi-MD disks?

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Here are the specifications for the original Minidisc, its Hi-MD formatted version, the Hi-MD 1GB disk, and (for comparison) Sony’s 650MB “MD-View” disk that was used in their Minidisc camcorder. Current MD format Existing MD formatted into Hi-MD Hi-MD 1GB Disc MD-View (from MD Discam) Data Capacity 177MB 305MB 1.0GB 650MB Magneto-Optical Recording MethodMagnetic Field ModulationMagnetic Field Modulation Domain Wall Displacement DetectionMagnetic Field Modulation on two layer medium (record layer and record assist layer) Laser Wavelength (λ) 780nm 780nm 780nm 655nm NA of Objective Lens 0.45 0.45 0.45 0.52 Diameter 64.8mm 64.8mm 64.8mm 64.8mm Thickness of Substrate 1.2mm 1.2mm 1.2mm 1.2mm (but with new substrate resin) Tracking Format Groove Recording Groove Recording Groove Recording Groove Recording Addressing Wobbling Groove (ADIP) Wobbling Groove (ADIP) Wobbling Groove (ADIP) Interlaced Wobbling Groove (ADIP with 1 address per track) Data Modulation EFM 1-7RLL 1-7RLL 1-7RLL Data Det

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Here are the specifications for the original Minidisc, its Hi-MD formatted version, the Hi-MD 1GB disk, and (for comparison) Sony’s 650MB “MD-View” disk that was used in their Minidisc camcorder.