Computer Science

Primary Memory & its Types

  • The first memory is called the main memory, or it can be referred to as “Inner memory” and Primary storage.
  • All types of computer memory that the processor receives directly via the data bus are called primary memory.


This allows the processor to access stores of administrative applications and processing data that is currently stored in memory space. Therefore, the use of memory is mandatory in all machine learning systems, including computers.


primary memory


Example of primary memory are random access memory (RAM) and read-only memory (ROM), which store programs. These memories have a low capacity and are manufactured using an integrated circuit (IC) and a semiconductor device. Data access speed is faster than secondary memory. It costs more than a second memory. When your computer starts, the CPU searches for key codes in RAM to retrieve. Otherwise switch to ROM. Yes, both are considered primary memory in a computer system.

In this course we will cover the following topics

Types of Primary Memory

1. RAM (Random Access Memory):

The term “RAM” means random access memory or may also refer to short-term memory. This is called “random” because you can read the data stored randomly at any time and from any physical location. This is a temporary reminder. RAM is volatile, so all data is occupied by the computer. This is the fastest type of memory. RAM stores the data currently being processed by the CPU and sends it to the GPU.

Subcategories of RAM (Random Access Memory):

• Static RAM:

Static RAM is a form of RAM, it consists of triggers and is used for primary storage, which is variable. Keep data locked while computer is on. SRAM is more expensive and consumes more power than DRAM. It is used as a cabinet in a computer system. Technically, SRAM uses more transistors than DRAM. This blocking scheme is faster than DRAM and uses 6 bits per data transistor than DRAM, which uses a 1-bit transistor.

• Dynamic Random Access Memory (DRAM):

It is another form of random access memory used as main memory, it stores information in capacitors for a short period of time (a few milliseconds) even when the computer is turned on. The data is updated from time to time for storage. DRAM is cheap, but it can store a lot of information. On top of that, it is even slower and consumes less power than SRAM.

2. ROM  (Read Only Memory):

Rome has long been an internal memory. ROM is “non-volatile memory” that prevents you from downloading. The ROM is very light, we have real or better writers. It’s like RAM going into the CPU. The ROM comes pre-registered and pre-loaded with software to keep most computers up to date.

Types of ROM (Read Only Memory):
    • Programmable Read Only Memory (PROM):

PROM stands for Programmable ROM. It can be programmed once and read multiple times. Unlike ROMs, EPROMs store content without electrical flow. The EPROM also does not change the memory. The main difference between ROM and EPROM is that ROM is pre-programmed by the computer manufacturer, while EPROM is designed as empty memory. The PROM can be programmed with a PROM burner and complete purification of internal filters.

• Erasable Programmable Read Only Memory (EPROM):

The EPROM is called e-prom. This type of memory retains content until it is exposed to high intensity ultraviolet light, which removes the content so that the memory can be rearranged.

    • Electrically Erasable Programmable Read Only Memory (EEPROM):

The EEPROM can be turned off (programmed) and turned off by the first electric waves in milliseconds. You can erase any grip data or the entire contents of the device. To write or delete this type of memory, you need a device called a PROM recorder.

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