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• n  a rigid magnetic disk mounted permanently in a drive unit

• hard disk
• fixed disk

News & Articles

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• This Nearly Indestructible Data Storage Disc Will Last a Billion Years
  Long term data storage is tricky. Hard discs and magnetic tapes lose their charge, CDs and DVDs are easy to scratch, and forget about punch cards . Now a student at the University of Twente has developed an optical storage system he says will survive for up to a billion years — even if you barbecue it. Read more...        
  Oct. 17, 2013 - Gizmodo