The most essential element of a computing system is its memory. Without it, the computer can’t perform simple tasks. In computer hardware, there are two types of memories – Primary memory (RAM and ROM) and Secondary memory (CD, hard drive, flash drive, etc.). In this article, we are going to explain the difference between RAM and ROM.
Different types of Memory
What is RAM?
1) RAM stands for Random-Acess Memory. It means that the CPU (Central Processing Unit) can directly access any address location of RAM memory. Thus, RAM is a quickly accessible memory of the computer. But it stores the data temporarily.
2) RAM is a volatile memory. It means that it loses the data stored in it when the power is turned off.
3) The programs that the CPU requires during the execution of any program are stored in this memory.
4) It is the fastest and also the costliest memory of a computer. It is a read-write memory of the computer. Thus, the data in RAM can be modified.
5) It is further classified into two types – SRAM (Static Random Access Memory) and DRAM (Dynamic Random Access Memory).
Types of Random-access Memory
1) SRAM i.e. the Static RAM requires the constant flow of the power/electricity to retain the data inside it.
2) DRAM i.e. the Dynamic RAM needs to be refreshed to retain the data it holds.
What is ROM?
1) ROM stands for Read-Only Memory. The CPU can not directly access the ROM memory. The data is, first, transferred to RAM and then the CPU can access that data from the RAM.
2) ROM is a non-volatile memory. This means that the data inside it retains even if the power of the CPU is switched off.
3) This memory stores all the crucial information essential to operate the system, like the program to boot the computer.
4) ROM is generally used in Embedded systems such as calculator, ARM devices, peripheral devices, etc.
5) It is further classified into 3 types – PROM, EPROM, and EEPROM.
Types of Read-Only Memory
1) PROM – It stands for Programmable read-only memory. Once the user has programmed it, the data and instructions in it cannot be changed.
2) EPROM – Erasable Programmable read-only memory. It means that it can be reprogrammed. In order to erase data from it, we need to expose it to ultraviolet light. After that, the user can reprogram it again,
3) EEPROM – Electrically erasable programmable read-only memory. To erase the data we need to apply an electric field, unlike the EPROM where we needed ultraviolet light. But we can only erase only portions of the chip.
Whats are the major differences between RAM and ROM?
Key differences between RAM and ROM.
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