Memory devices

Memory devices

1. Computer memory is any physical device capable of storing information temporarily, like RAM (random access memory), or permanently, like ROM (read-only memory).

2. RAM

   • Random access memory
   • form of computer memory that can be read and changed in any order
   • typically used to store working data and machine code
   • allows data items to be read or written in almost the same amount of time irrespective of the physical location of data inside the memory.
   • RAM is volatile, requiring power to store data.
   • RAM chips often range in storage capacity from 1 to 256 GB.
   • used in computers to temporarily store files in use

3. ROM

   • Read Only Memory
   • ROM is a storage medium that is used with computers and other electronic devices.
   • Data stored can only be read
   • mostly used for firmware updates.
   • A simple example of ROM is the cartridge used with video game consoles, which allows one system to run multiple games.
   • Unlike RAM, ROM is non-volatile, which means it keeps its contents regardless of whether or not it has power.

4. Hard disk drive

   • It is non-volatile
   • electromechanical data storage device that uses magnetic storage to store and retrieve digital information using one or more rigid rapidly rotating disks coated with magnetic material.
   • Stores data permanently
   • secondary storage device RAM primary storage device
   • It is usually installed internally in a computer, attached directly to the disk controller of the computer's motherboard.
   • Hard drives are powered by a connection to the PSU (power supply unit).
   • Far slower to access data than ROM or RAM chips
   • Examples of data that may be stored on a computer's hard drive include the operating system, installed software, and the user's personal files.