difference between Ram, ROM and hard disk memory

 The difference between ram and hard disk memory It often seems confusing, with overlapping terminology, you may not seem to know the difference.  It does not allow the storage of personal data. It reads and writes data and will continue to save memory unless the system turns off. The hard disk is a predictable memory that allows the user to store and delete data; Your ability to store in it depends on its size.


Read-Only Memory (ROM)

Read-only memory (ROM) is a type of storage medium that permanently stores data on personal computers (PCs) and other electronic devices. It contains the programming necessary to start the computer, which is necessary for starting up; performs large I/O tasks and stores programs or software instructions. Because the ROM is read-only, it can not be changed; it is durable and non-volatile, which means that it retains its memory even after disconnecting the power supply. Whereas the random access memory (RAM) is unstable; is lost when the power is removed.</span


difference between ram and hard disk memory
difference between ram and hard disk memory

There are many ROMs on the motherboard and several on the expansion boards. Chips are necessary for the basic input/output system (BIOS), boot, read and write on peripherals, basic data management, and software for basic processes for specific tools.



difference between ram and hard disk memory   




difference between ram and hard disk memory
difference between ram and hard disk memory


When it comes to memory capacity, the hard disk starts where the RAM memory ends; this means that the size of the hard disk is always larger than the size of the RAM. Currently, the size of RAM varies from 256 MB to 32 GB. The available hard disk size is from 500 GB to 8 TB. The hard disk is more similar to a machine that has different parts, such as a write module and reader, while the RAM is a smaller (silicon) circuit composed of circuits.



RAM memory does not allow connecting external RAM if RAM is not available. The hard disk allows you to add an external hard disk to improve disk space. You can also completely change it and add more capacity. Connecting an external drive, when the hard disk stores more and more data, provides increased storage capacity without losing files or data.


The size of the hard disk you want to connect to the system, however, depends on the power necessary to run the computer with an additional storage location, as well as on the physical surface it will use.




One of the primary goals of RAM is to speed up your computer’s performance; it means that your system will run slower when its RAM memory is small (limited). However, the primary purpose of the hard disk is to store information, and having a hard disk with a smaller capacity may not affect the speed of the system.



Each time a task is executed, the CPU sends and receives program instructions and data to and from RAM. User data will be transferred to the hard disk as part of these operations.



The memory used during the operation comes from RAM because RAM is much faster than the hard disk. RAM is faster and data is transferred from the hard disk to RAM to ensure that the processor only deals with the fastest data access.


Additional RAM

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difference between ram and rom

There is one major difference between ram and rom. ROM can store data without power, and RAM does not. Basically, the ROM is designed for permanent storage, and RAM is for temporary storage.


Alternative explanation

The ROM system is a non-volatile storage medium. The ROM does not require a permanent power source to store information stored on it. In contrast, the RAM system is unstable, which means that it loses all information it holds when the power is turned off.



difference between ram and rom
difference between ram and rom


other difference between ram and rom

The ROM chip is used primarily in the process of starting the computer, while the RAM system is used in the normal operation of the computer after the operating system is loaded.
Writing data to the ROM system is a much slower process than saving it in a RAM system.


The RAM chip can store many gigabytes (GB) of data, from 1 GB to 256 GB per chip. The ROM chip stores many megabytes (MB) of data, typically 4 MB or 8 MB per chip.



Computer ROM

A good example of ROM is the BIOS of the computer, the PROM chip, which stores the programming needed to start the initial computer startup process. Using a non-volatile storage medium is the only way to start the startup process of computers and other devices. ROM chips are also used in game system cartridges, such as the original Nintendo, Gameboy, Sega Genesis and many more.

Differences in use

RAM memory allows the computer to quickly and efficiently read data to run applications efficiently, while ROM stores the program required to initially start the computer and perform diagnostics. RAM is a popular type of memory found in computers and printers and can reach up to several gigabytes. ROM is usually only a few thousand bytes of memory in personal computers. RAM is the basic and unstable memory





Different types of RAM vs ROM


Another difference between ram and rom are The main types of RAM are static RAM (SRAM), dynamic RAM (DRAM). Static RAM is more expensive and has more storage capacity than dynamic RAM, which needs to be refreshed more often, and therefore slower.ROMs are integrated circuits that contain data and usually cannot be changed. There are several types that may be slightly modified, including programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) and flash, which is a type of EEPROM memory.


PROM is a type of ROM that can only be programmed once by a special device and uses high voltage. EPROM can be rewritten using UV radiation, while EEPROM can be rewritten electrically and these devices do not need to be removed from the computer. Flash drives are a modern version of EEPROM and the fastest for erasing and rewriting. Some other popular ROM types are CD-ROMs, CD-Rs, and CD-RWs that are used to store multimedia and music files.