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15 cards from this deck
Non-volatile storage, keeps data when computer is off
Magnetic, optical, solid-state
Hard disk drives (HDDs), magnetic tape drives
Platters
Two magnetic polarities (north-south or south-north) represent 1s and 0s
Concentric tracks divided into sectors
CD drives, DVD drives, Blu-ray drives
Land = 1, pit = 0
Single spiral track from centre to edge
Mobile phones, smart watches, USB sticks, SSDs
No moving parts
Full pool = 1, empty pool = 0
High capacity and fast data access
Excellent portability, very cheap to produce
Fast access, no moving parts, reliable, low power
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