(2 pcs) 12" Aluminum Disc Cobalt/Nickel Chromium Plated Vintage Poly-Disc For Sale
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Vintage Analog Aluminum Data DiscsManufacturer: Poly-Disc Systems Diameter: 12"Thickness: 0.22"Center Hole Diameter: 2.0"Weight each: 2.5 lbs Estimated Manufacture date: Around 1979Substrate: Aluminum AlloyMagnetic Layer: Left Disc: Chromium Alloy Right Disc: Nickel/Cobalt bonded alloy Condition:Both discs are very flat and balanced to 3600 rpm.Left Disc (Chrome): Head contact marks on both sides (30% on one side, 1% on the other side)Right Disc (Blue): Head crash down to substrate on one side as shown. Other side light burnish marksBoth discs are sold as collectibles or for artistic projects and are not usable for data storage. Buyer receives 2 discs as shown.
