All personal computers need different types of memory to operate. We have the memory to store data, but we also have RAM and ROM, two types of memory that are sometimes confused. So today we are going to look at their differences, types, and uses to clear the misconception by reading RAM and ROM Difference.
RAM vs ROM! Let’s start. You probably already know what is RAM? Because it’s one of the components we usually talk about when we talk about computer hardware, and you can buy it at any computer store.
Even if you don’t know it, computers also have a ROM, which is essential for their functioning. Let’s see what each of these Types of Memory is and what they are used for, in order to understand the differences between them.
What is Difference Between RAM and ROM?
Let’s go through this article RAM vs ROM and have a detailed look into these two.
What is RAM?
RAM stands for Random Access Memory. It is so-called because its content constantly changes according to the needs of the computer and it is managed by the processor. RAM is also known as the working area of a computer. It is used to store the programs and data in use at a given time so that the processor can use them immediately, in real-time, effectively.
Why RAM is Called Volatile Memory? This type of memory is volatile, which means that the data it contains is lost when the computer is turned off.
Main Types of RAM
- DRAM: stands for Dynamic RAM. It is the most used in PCs and, in fact, in almost all devices, including smartphones. This type of memory is made up of capacitors that force the controller to store the data it contains several times per second so that it is not lost.w It is used for conventional RAM, and unlike SRAM, it needs to be refreshed from time to time to retain data. Which results in more consumption of power during this refreshing process. During the refreshing process, the processor cannot access data from DRAM. This process makes it slower due to continuous refreshing and also this type of RAM is cheaper.
- SRAM: stands for Static RAM, and as the name suggests, it is static. In this case, the data is stored until the power is removed without the controller having to constantly refresh the data; it is faster and consumes less power than DRAM, but is used less because it is more expensive to manufacture and allows much lower densities (capacities). SRAM is used for CPU and GPU caches and registers.
On the other hand, it should be clarified that NVRAM, Non-Volatile RAM, refers to NAND Flash memory, more precisely to DIMM memory modules that incorporate NAND Flash memory chips instead of conventional RAM. Regardless of the type of flash memory, it is not used as RAM except in components that operate at very low clock speeds.
What is ROM?
ROM is short for Read Only Memory. The main difference between RAM and ROM is that ROM is non-volatile, which means that the data stored in it is retained even if the computer is turned off. This type of memory has a much lower capacity than RAM and is also much slower.
ROM was originally designed as read-only memory but has since evolved into non-volatile memory that can be written in certain specific ways. ROM stores things like the BIOS and device firmware.
Main types of ROM
- PROM: stand for Programmable ROM. This type of ROM is initially blank at manufacturing time. But the user or manufacturer can write instructions in it. The disadvantage of this kind of ROM is, once contents are programmed in it, the content or data cannot be erased or changed.
- EPROM: stand for Erasable Programmable ROM. This type of ROM is also initially blank. The user or manufacturer can write data or program on it by using some kinds of special devices. The advantage of this kind of ROM is that the content written in EPROM can be erased or removed and new data can also be added.
- RRPROM: stand for Electrically Erasable Programmable ROM. This is a more advanced type of ROM. Data and programs can be written and changed with the help of electrical devices. It allows users to add or delete data at the same time.
RAM is a kind of temporary memory that stores information that the processor needs immediately so that it does not have to search for it in system memory, or calculations that the processor has made and must use later so as not to have to recalculate them.
RAM differs from ROM not only because it is a fixed memory (i.e. it is not elastic and data is retained even without power), but also because it is read-only and cannot be overwritten. This type of memory is used, for example, to store the BIOS or firmware of a device.