Secondary Memory – Comparison Table
Primary memory is used for temporarily storing data that is actively being used by the computer’s CPU, while secondary memory (storage) is used for long-term data storage, such as files and programs that are not currently in use. Listed below are some other primary and secondary memory differences.
Comparison Parameters
Primary Memory
Secondary Memory
Storage Validity
Primary memory is the main memory and stores data temporarily.
Secondary memory is the external memory and stores data permanently.
Access
The CPU can directly access the data from the Primary Memory
Secondary Memory cannot be directly accessed by the CPU. Volatility
Primary memory is volatile. In the event of a power outage, it loses data. Secondary memory is non-volatile; data is stored even during a power failure.
Storage
Data is stored inside costly semiconductor chips.
Data is stored on external hardware devices like hard drives, floppy disks, etc.
Division
Primary memory can be divided into RAM and ROM.
Secondary memory does not have such classification. Secondary memories are permanent storage devices like CDs, DVDs, etc.
Examples
RAM (Random Access Memory), ROM (Read-Only Memory).
USB drives, CDs, DVDs, Blu-ray, HDD (Hard Disk Drive), SSD (Solid State Drive), and cloud storage Speed
Faster
Slower
Stored data
preserves the data currently being used by the computer. It can save various types of data in various formats and huge sizes.
Cost
More expensive per GB due to high-speed and advanced semiconductor technology.
More affordable per GB due to the availability of diverse storage technologies like HDDs and SSDs.
Power Dependency
Operates only when the computer is powered on. Data is wiped off in case of power loss.
operates without regard to power status. Data remains saved in the storage device.
Usage
Essential for the execution of programs and real-time processing by the CPU.
Primarily used for long-term data storage and archival purposes.
