• Skip to main content
  • Skip to primary sidebar
  • Skip to secondary sidebar
  • Skip to footer

Computer Notes

Library
    • Computer Fundamental
    • Computer Memory
    • DBMS Tutorial
    • Operating System
    • Computer Networking
    • C Programming
    • C++ Programming
    • Java Programming
    • C# Programming
    • SQL Tutorial
    • Management Tutorial
    • Computer Graphics
    • Compiler Design
    • Style Sheet
    • JavaScript Tutorial
    • Html Tutorial
    • Wordpress Tutorial
    • Python Tutorial
    • PHP Tutorial
    • JSP Tutorial
    • AngularJS Tutorial
    • Data Structures
    • E Commerce Tutorial
    • Visual Basic
    • Structs2 Tutorial
    • Digital Electronics
    • Internet Terms
    • Servlet Tutorial
    • Software Engineering
    • Interviews Questions
    • Basic Terms
    • Troubleshooting
Menu

Header Right

Home » Fundamental » Memory » What is Secondary Memory? – Definition
Next →
← Prev

What is Secondary Memory? – Definition

By Dinesh Thakur

Secondary memory is also known as secondary storage. The secondary memory is accessed indirectly via input/output operations. This memory is also called permanent, external, stable or persistent memory. It is characterized by its slowness and cheapness, relative to the RAM, and by its permanent appearance.

The CPU does not directly process it. It’s content firstly copied into ram and then transferred to CPU. The Secondary memory store data that can be easily retrieved only by the main memory and used by the processor. It is slower than RAM but larger storage capacities than primary memory.

The processed data is, generally, stored in a digital format either on a hard disk drive (HDD) or floppy disk drives, optical drives, tape drives, external hard drives, RAID and USB storage devices, which is called Secondary memory, or removable mass storage devices(MSDs). Primary storage devices are known as Random access memory (RAM), While RAM (Random Access Memory) has fewer data storage capacity, and the data got disappeared when the computer is turned off.

Secondary memory devices are not only convenient for storing backup files, but they also allow computer users to expand their ability to transfer large amounts of data to another Secondary memory devices.  

Secondary memory devices are nonvolatile in nature and data does not disappear when the computer turned off and on again. Secondary memory is cheaper than primary memory but is also slower in both reading and writing. Primary memory (RAM) is faster but does not store data permanently, instead of loading secondary memory slower data in the primary memory to make efficient use of it. Unlike primary memory, secondary memory also does not access the CPU directly from the computer.

Magnetic or hard drives are the most common type of secondary memory. All modern computers usually use at least one internal hard disk drive (HDD). These are also frequently attached externally through a Universal Serial Bus (USB), and they also used in redundant and recoverable storage networks in case of accidental loss of data.

Optical storage discs, such as compact discs (CDs) and digital video discs (DVDs), were the initial successors on the secondary hard drive. Their ability to hold much more data and their low cost have been more than enough to compensate for slow write speeds. As technology has improved and media prices have remained low, optical storage remains a viable and accessible medium for portable secondary storage.

Flash memory has seen a surge in popularity and technological progress. It works much like a hard drive concerning access, much faster thanks to the storage media are not sequentially written as a hard disk tray. The flash memory may be considered slow nonvolatile memory, but it is still unable to access the CPU of a computer directly. As its capacity has increased, while its prices have dropped, flash memory has become a direct competitor of hard disk drive (HDD): it has a fast read and writes time and better mechanical stability because it has no moving parts.

You’ll also like:

  1. What is Auxiliary memory (secondary storage)?
  2. What is Flash Memory? – Definition
  3. What is Non-Volatile Random Access Memory (NVRAM)? – Definition
  4. What is virtual memory? – Definition
  5. What is Primary Memory? – Definition
Next →
← Prev
Like/Subscribe us for latest updates     

About Dinesh Thakur
Dinesh ThakurDinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps.

Dinesh Thakur is a Freelance Writer who helps different clients from all over the globe. Dinesh has written over 500+ blogs, 30+ eBooks, and 10000+ Posts for all types of clients.


For any type of query or something that you think is missing, please feel free to Contact us.


Primary Sidebar

Computer Memory

Computer Memory

    • Computer - Memory
    • Computer - Types of Memory
    • Computer - RAM
    • Computer - Types of RAM
    • Computer - ROM
    • Computer - RAM Vs ROM
    • Computer - Associative Memory
    • Computer - SemiConductor Memory
    • Computer - Primary Memory
    • Computer - Auxiliary Memory
    • Computer - Flash Memory
    • Computer - EPROM
    • Computer - Secondary Memory
    • Computer - Sequential Access Memory
    • Computer - EEPROM
    • Computer - Bubble Memory
    • Computer - DDRAM Vs FPMDRAM
    • Computer - SDRAM
    • Computer - DRAM
    • Computer - VRAM
    • Computer - ECC Memory
    • Computer - PC RAM
    • Computer - NVRAM
    • Computer - Register

Computer Devices

    • Computer - Input/Output Devices
    • Computer - Printer
    • Computer - Laser Printer
    • Computer - Hard Drive
    • Computer - Dot-Matrix Printer
    • Computer - Impact and Non-Impact
    • Computer - Storage Devices
    • Computer - Primary Storage
    • Computer - Types of Storage
    • Computer - Line Printer

Other Terms

    • Computer - Interrupt
    • Computer - Classify Storage Devices
    • Computer - CISC and RISC
    • Computer - Access Method
    • Computer - Memory Mapping
    • Computer - OMR
    • Computer - Access Time
    • Computer - Types of integrity
    • Computer - Buffer
    • Computer - Associative Cache
    • Computer - RAM Parity
    • Computer - Disk Cache
    • Computer - Disk Controller
    • Computer - Cycle Time
    • Computer - IDE
    • Computer - RAM Disk
    • Computer - Cartridge Hard Disk
    • Computer - DPI
    • Computer - Fatal Error
    • Computer - Install HDD/SSD
    • Computer - Input Technologies
    • Computer - OCR

Binary Number

  • CO - EBCDIC
  • CO - ASCII Code
  • CO - Bit
  • CO - ASCII
  • CO - BCD Numbers
  • CO - Binary Numbers
  • CO - Byte
  • CO - Bits and Bytes
  • CO - Machine Code

Other Links

  • Computer Memory - PDF Version

Footer

Basic Course

  • Computer Fundamental
  • Computer Networking
  • Operating System
  • Database System
  • Computer Graphics
  • Management System
  • Software Engineering
  • Digital Electronics
  • Electronic Commerce
  • Compiler Design
  • Troubleshooting

Programming

  • Java Programming
  • Structured Query (SQL)
  • C Programming
  • C++ Programming
  • Visual Basic
  • Data Structures
  • Struts 2
  • Java Servlet
  • C# Programming
  • Basic Terms
  • Interviews

World Wide Web

  • Internet
  • Java Script
  • HTML Language
  • Cascading Style Sheet
  • Java Server Pages
  • Wordpress
  • PHP
  • Python Tutorial
  • AngularJS
  • Troubleshooting

 About Us |  Contact Us |  FAQ

Dinesh Thakur is a Technology Columinist and founder of Computer Notes.

Copyright © 2025. All Rights Reserved.

APPLY FOR ONLINE JOB IN BIGGEST CRYPTO COMPANIES
APPLY NOW