Types of secondary storage (Edexcel GCSE Computer Science): Flashcards
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Secondary storage
Secondary storage
Non-volatile storage, keeps data when computer is off
Three types of secondary storage
Three types of secondary storage
Magnetic, optical, solid-state
Magnetic storage examples
Magnetic storage examples
Hard disk drives (HDDs), magnetic tape drives
HDD spinning metal plates
HDD spinning metal plates
Platters
HDD binary representation
HDD binary representation
Two magnetic polarities (north-south or south-north) represent 1s and 0s
HDD data organisation
HDD data organisation
Concentric tracks divided into sectors
Optical storage examples
Optical storage examples
CD drives, DVD drives, Blu-ray drives
Optical: land and pit values
Optical: land and pit values
Land = 1, pit = 0
Optical disk track organisation
Optical disk track organisation
Single spiral track from centre to edge
Solid-state storage examples
Solid-state storage examples
Mobile phones, smart watches, USB sticks, SSDs
Solid-state key characteristic
Solid-state key characteristic
No moving parts
Solid-state electron pool values
Solid-state electron pool values
Full pool = 1, empty pool = 0
Magnetic storage advantages
Magnetic storage advantages
High capacity and fast data access
Optical storage advantages
Optical storage advantages
Excellent portability, very cheap to produce
Solid-state advantages
Solid-state advantages
Fast access, no moving parts, reliable, low power