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Primary & Secondary storage Flashcards
OCR GCSE J277 Computer Science specification
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RAM
Random Access Memory, volatile memory used for temporary data storage while programs are running.
ROM
Read-Only Memory, non-volatile memory used to store the computer's start-up instructions.
Primary storage
Fast, volatile memory used to store data and instructions currently in use by the CPU.
Virtual memory
A section of secondary storage used as temporary RAM when physical RAM is full.
Optical storage
Uses lasers to read/write data on discs like CDs, DVDs, and Blu-rays.
Magnetic storage
Uses magnetic fields to store data on devices like hard drives and tapes.
Solid state storage
Uses flash memory to store data, offering fast access speeds and durability.
RAM characteristics
Volatile, fast, and used for temporary storage of active processes.
ROM characteristics
Non-volatile, cannot be changed, and stores essential start-up instructions.
Virtual memory purpose
Allows the system to handle more processes than physical RAM can support when full
Optical storage advantages
Portable, cheap, and widely compatible.
Optical storage disadvantages
Limited capacity, slower access speeds, and less durable.
Magnetic storage advantages
High capacity and relatively low cost per GB.
Magnetic storage disadvantages
Less durable and slower compared to solid state storage.
Solid state storage advantages
Fast access speeds, durable, and portable.
Solid state storage disadvantages
Higher cost per GB compared to magnetic storage.
RAM vs ROM
RAM is volatile and temporary; ROM is non-volatile and permanent.
Primary storage vs secondary storage
Primary storage is fast and volatile; secondary storage is slower and non-volatile.
Virtual memory drawbacks
Slower than physical RAM and can cause system performance issues.
Optical storage examples
CDs, DVDs, Blu-ray discs.
Magnetic storage examples
Hard disk drives (HDDs), magnetic tapes.
Solid state storage examples
Solid state drives (SSDs), USB flash drives.
Primary storage need
Essential for storing data and instructions actively used by the CPU.
Secondary storage need
Used for long-term storage of data and programs.
RAM in embedded systems
Stores temporary data for the device's operations.
ROM in embedded systems
Stores the firmware or software needed to operate the device.
Cache memory
A small, fast type of primary storage located close to the CPU.

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