Big Yellowish-brown disc from Grandma's house. Aunt says it's an old computer part. Uncle says it's from a construction site. It's more than 20 years old. : r/whatisthisthing
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![CDC/Magnetic Peripherals 9427H-C Hawk CDD 14" 10MB Removable Cartridge Drive for Parts | RecycledGoods.com CDC/Magnetic Peripherals 9427H-C Hawk CDD 14" 10MB Removable Cartridge Drive for Parts | RecycledGoods.com](https://cdn11.bigcommerce.com/s-a1x7hg2jgk/images/stencil/1280x1280/products/95/1396/cdcmagnetic-peripherals-14-10mb-removable-cartridge-drive-for-parts-cdc_magperf_hawk_2.10__88113.1489906316.jpg?c=2?imbypass=on)
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![admford on Twitter: "@scienmag @nixcraft 1961 disk drive platter. Used with the CDC 6600 System. 4 Mbytes per side, 39 inches diameter. 50 amps 208v three phase power required. https://t.co/1HcwuQUpmO" / Twitter admford on Twitter: "@scienmag @nixcraft 1961 disk drive platter. Used with the CDC 6600 System. 4 Mbytes per side, 39 inches diameter. 50 amps 208v three phase power required. https://t.co/1HcwuQUpmO" / Twitter](https://pbs.twimg.com/media/DA-KkL_XcAAOnBB.jpg:large)