Difference Between RAM And ROM | With Table

We are presenting some important information about the computer memories. Through the difference between RAM and ROM, we will minutely observe various aspects of these two types of memories. Both of these memories have their own utilities in computers, mobile phones, tablets, laptops, and various other electronic devices.

Computer memory- The storage devices are a vital part of computer systems. RAM and ROM are two different types of computer memories which are used to store data in a computer system. Both RAM and ROM are used as computer memories, but they are not identical. The major differences between RAM and ROM are as follows-

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The deflation of RAM and ROM shows the major difference between RAM and ROM.


RAM is the acronym for “Random Access Memory”. It is a volatile memory. It is a temporary memory. The contents in this memory are lost when the power turns off or the system is not shut down properly. RAM is also referred to as read-write memory.


ROM stands for “Read Only Memory”. It is a permanent memory. The data stored in this memory is permanent and is not lost even after a power off or unexpected shutdown. Since ROM is read-only memory the user cannot make changes in this memory usually.

Difference Between RAM And ROM
Difference Between RAM And ROM


One of the major differences between ROM and RAM is the nature of stored data. Due to various types of data needs, we need different memory devices. The stored data in RAM is basically non-permanent in nature. It can be written, modified or deleted any number of times. Usually, RAM is used to store a large volume of data which can be modified in the future. While in case of ROM data is stored permanently.


The access speed is also a major difference between RAM and ROM. RAM is a high-speed memory usually; RAM chip is used for this memory which is a part of the motherboard of CPU. It provides fast access to data to the processor. ROM is comparatively slower than RAM.

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Another difference between RAM and ROM is that of size. RAM is large in size with higher memory storage capacity. On the other hand, ROM is smaller in size than the RAM and has lesser memory retention and storage capacity.


The RAM is used as primary memory. It comprises of DRAM, DIMM modules and CPU Cache (SRAM). RAM is used for regular operations which involve memory space. On the other hand, ROM is used in firmware such as BIOS, UEFI, Microcontrollers, RFID tag, medical devices and other devices where permanent memory is required. ROM is basically used to store start-up modules.

Writing Operation

The major difference between ROM and RAM is the writing operation. The data can be written quickly in RAM. On the other hand, in the case of ROM, data can be written slowly.


The available range in the market is also a difference between RAM and ROM. The size of the RAM ranges from 64 MB to 4 GB. A user can choose RAM according to the utility. On the other hand, ROM is comparatively smaller in memory size.

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RAM- Read Only Memory is classified as SRAM and DRAM.
SRAM stands for Static Random Access Memory.
DRAM stands for Dynamic Random Access Memory.

ROM- Read Only Memory is classified as PROM, EPROM, and EEPROM.
PROM stands for Programmable Read Only Memory.
EPROM stands for Erasable Programmable Read Only Memory.
EEPROM is an acronym for full form Electrically Erasable Programmable. Read Only Memory.

Items For ComparisonRAMROM
Stands ForRandom Access MemoryRead Only Memory
DataNon-Permanent In NatureUsually Stored Permanently
SpeedUsed For Fast Access Of DataComparatively Slow In Nature
SizeLarger In Size, From 64 MB To 4 GBComparatively Smaller In Size
UsePrimary Memory, Used For Regular OperationsROM Is Used For BIOS, UEFI, Where Permanent Memory Is Required
Writing OperationQuickly Writes DataWrites Slowly Compared To RAM

Final Words

Hope you liked the above-mentioned details and found them interesting. In the above-mentioned differences between RAM and ROM, we represented all the information in a very precise and easy to understand manner.

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