memory devices

memory devices

1. RAM

   • stands for Random Access Memory
   • Referred to main memory, primary memory and system memory
   • it is a hardware device that allows information to be stored and retrieved on a computer.
   • as information is accessed randomly instead of sequentially like it is on a CD or hard drive, access times are much faster
   • unlike ROM, RAM is a volatile memory and requires power to keep the data accessible

2. ROM

   • stands for Read Only Memory
   • a storage medium that is used with computers and other electronic devices. it may ONLY be read as it say in its name
   • it is mostly used for firmware updates.
   • an example of a ROM is a cartridge used with video game consoles.
   • where is the ROM on the computer
     • For the computer, the main EEPROM and BIOS is on the computer motherboard.

3. hard disk drive

   • sometimes abbreviated to hard drive,HD or HDD
   • it is a non-volatile data storage device
   • it is usually installed internally in a computer, attached directly to the disk controller of the computers motherboard.
   • it contains one or more platters, housed inside of air-sealed case. Data is written to the platters using a magnetic head, which moves rapidly over them as they spin.
   • 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.

4. the difference between...

   • RAM and ROM
     • unlike ROM, RAM is a volatile memory and requires power to keep the data accessible.
   • RAM and hard disk drive
     • the RAM stores temporary data whereas the HDD stores data permanently