Table of Contents
Introduction
Memory and Storage are the 2 major components of a computer or PC. Both work in collaboration with PC/Laptop processor to access or process data like processing of information for an application, but in this blog, we are going to focus on the difference between memory and storage (memory vs storage).
Memory
Memory (RAM – Random Access Memory) is computer hardware component that is capable of storing information temporarily while storage is a hardware component that is non-volatile where data can stay even when the computer isn’t being used and is turned off.
Related- RAM vs ROM
Memory is of 2 types i.e.
- DRAM (Dynamic RAM): Volatile memory that stores each bit as a charge in a capacitor, requiring periodic refresh, offering high density and low cost; used as main system memory.
- SRAM (Static RAM): Volatile memory that stores each bit in a flip-flop circuit, needing no refresh, offering faster speed at lower density/higher cost; used in caches.
Storage
An example of storage can be many like HDD (Hard Disk Drive), SDD (Solid State Drive), USB drive, SD Card, CompactFlash, DVD etc. The knowledge of different storage types helps you to design your dream PC using services like PC builder, and also gives you a better perspective on future enhancements.
Differences between Memory & Storage
- Memory has a big benefit that it processes data very fast. In fact, it can access data and information instantly. On the other hand, storage is considerably slower than memory devices and cannot access or modify data as fast.
- In terms of cost, memory components are considerably cheaper compared to storage. SSDs and HDDs are known to be higher in price than memory (RAM) in the market.
- Another significant specification that differs memory from storage is the data storage size limit. While memory (RAM) is lately known to reach up to GBs, Storage has crossed GB landmark and has reached TB and above the limit.
- RAM is placed within the device, however, storage devices are versatile and have flavours which may be placed internally or externally.
Comparison Table: Memory vs Storage
To illustrate the above-shared points, below table clearly articulates the difference between memory and storage –
| PARAMETER | MEMORY | STORAGE |
|---|---|---|
| Definition | Computer hardware component that is capable of storing information temporarily. | A hardware component that is non-volatile where data can stay even when the computer isn’t being used and is turned off |
| Type | Temporary storage if data | Permanent storage of data |
| Examples | RAM (DRAM,SRAM) | HDD, SDD, USB drive, SD Card , CompactFlash, DVD etc. |
| Volatile / Non-volatile | Volatile | Non-volatile |
| Processing speed | Very fast. RAM (memory) can access data and information instantly | Slower than memory devices. Storage devices cannot access or modify data as fast as the memory. |
| Cost | Cheaper than storage | Expensive than memory |
| Size | Upto GBs | Much Larger than memory and goes upto TBs and above |
| Placement | Internal | Internal or external |
| Duration | Usually for storing data for short time | Usually for storing data for long time |
Download the comparison table: Memory vs Storage
Related FAQS
Q.1 Why is memory so much faster than storage?
Memory is built from transistor-based cells (SRAM/DRAM) directly addressable by the CPU with nanosecond latency, while storage relies on mechanical or flash-based media with much higher access latency and block-level I/O.
Q.2 Why does data disappear from memory but not from storage?
RAM cells require continuous power to hold a charge or state, so data is lost on power-off; storage media (magnetic platters or NAND flash cells) retain their state without power.
Q.3 Why can’t we just use storage as memory or vice versa?
Storage is too slow and has limited write-endurance (especially flash) for the CPU’s constant read/write cycles, while memory is too expensive and lacks persistence to serve as long-term storage — each is optimized for a different point on the speed-cost-durability tradeoff.
Q.4 How does cache fit into the memory-storage hierarchy?
Cache (SRAM) sits between the CPU and main memory (DRAM) as an even faster, smaller, more expensive tier that holds frequently accessed data to reduce the latency gap between the CPU and RAM.
Related- AWS S3 (Simple Storage Service)
Disclaimer: This vlog contains affiliate links. If you purchase through these links, we earn a small commission at no extra cost to you, but that is what keeps this blog alive and the helpful content coming your way.
ABOUT THE AUTHOR
You can learn more about her on her linkedin profile – Rashmi Bhardwaj
