What Is Computer Memory ?
Computer Memory , Type And How It’s Work –
The way humans use the brain to remember. But a computer does not have a brain like ours. It uses memory to remember data and instructions.
Where it is also known as computer memory. This memory is an internal part of C.P.U, it is also called Computer’s Main Memory, Internal Memory, or Primary Memory.
Computer memory is divided into two parts –
1. Primary Memory: – Primary memory is also often called main memory, which resides inside the computer and its data and instructions are used fast and directly by the CPU. Because the data written in it gets erased when the computer is shut down or the power goes down, it is called primary memory.
It is also called primary memory or main memory.
Example – RAM
2. Secondary Memory: – This is known as Secondary Memory, it is used to store a large amount of data permanently, so Secondary Memory is described as storage and not memory.
Example – Harddisk
Unit of computer memory –
Just as we have units such as seconds for measuring time, decibels for measuring noise, mm for measuring distance, and grams for measuring weight, similarly in the world of computers, units are also used to measure storage capacity. Is decided , it is called a unit or unit of computer memory.
Bit or byte –
The data stored in memory is converted to 0 or 1, 0 and 1 are jointly called binary digits. In short, they are also called bits. This bit is the smallest unit to measure the space in a computer’s memory.
Unit and Unit –
• 1 bit = 0, 1
• 4 bit = 1 nibble
• 8 bit = 1 byte (Byte)
• 1000 bytes (Byte) = one kilobyte (KB)
• 1024 kilobytes (KB) = one megabyte (MB)
• 1024 megabytes (MB) = one gigabyte (GB)
• 1024 gigabytes (GB) = one terabyte (TB)
• 1024 Terabytes (TB) = One Pentite (PB)
• 1024 pedabytes (PB) = one exabyte (EB)
• 1024 exabytes (EB) = one zetbyte (ZB)
• 1024 zetabytes (ZB) = one zetabyte (YB)
There are two types of memory –
1. Primary Memory
2. Secondary Memory
Primary memory :-
There are mainly two types of primary memory –
(RAM)- RAM (Random Access Memory) is the temporary memory of a computer. Data input from the keyboard or any other input device is stored in the RAM before processing! The data stored in the REM is only for a short time, if the power is lost then the data is erased ie the REM is a temporary memory. is ! There are many types of RAM capacity or size such as – 4 MB, 8 MB, 16 MB, 32 MB, 64 MB, 128 MB, 256 MB etc.
There are three types of RAM –
• Dynamic RAM
• Synchronous RAM
• Static RAM
1. Dynamic RAM: – dynamic ram is also known as DRAM in short form. And this is the simplest and cheapest type of RAM. DRAM is refreshed repeatedly to keep the data. You will be surprised by this information. But it refreshs thousands of times in a second. Because of which, it also worsens quickly. DRAM is made up of cells. That is, made of a capacitor and a transistor
2. Synchronous RAM: – Synchronous RAM is much faster than DRAM. The reason for its high speed is that it is the CPU. Refresh according to clock speed. That is why they transfer data faster than the DRAM.
3. Static RAM: – Static RAM is RAM that is less refreshed. Due to less refresh, it keeps the data in memory longer. S-RAM is faster and more expensive than DRAM.
- 2. ROM -;
The full name of ROM is read only memory. It is a permanent memory in which programs are stored at the time of building the computer. Store programs cannot be changed and deleted in this memory, they can only be read. So this memory is called read only memory. The data stored in ROM is not destroyed even after the computer is switched off. Hence ROM is called permanent memory. There are different types of follicles which are as follows –
• PROM (Programmable Read Only Memory)
• EPROM (Erasable Programmable Read Only Memory)
• EEPROM (Electrical Programmable Read Only Memory)
PROM’s full name is Programmable Read Only Memory, it is such a memory that once the data is stored in it, it cannot be erased nor change.
The full name of EPROM is Erasable Programmable Read Only Memory it is similar to PROM but the program stored in it can be erased only by ultraviolet rays and new programs are stored. Can be done.
The full name of EEPROM is Electrical Programmable Read Only Memory. There is also a new technology EEPROM, in which programs can be erased from memory by method.
- 2. Secondary memory :-
Secondary memory is used to keep programs and data for longer. For a long time, the data that needs memory is called secondary memory. That is, the secondary is the memory in which we can store more data.
There are several types of secondary memory –
There are two types of secondary memory –
Internal – It is in the inner part of the computer, which we also call Hardisk.
Extranemal – It is mounted on the external part of the computer and is placed in a semantic port such as – CD, DVD, USB disk, PENDRIVE, EXTERMNAL HARDRIVE, FLOPPY disc, etc.
Here Is The All Example With Full Discription
drive The hard disk drive is made by joining one disk on top of it as a platter like an importer disk. We make the disk from non-magnetic metal such as aluminum alloys are attached to a magnetic metal of 10-20nm. These disks have a diameter of up to 14 inches and run on computers up to 4200 rpm and servers up to 15000 rpm. The data is stored with the help of magnetic and non-magnetic coating. Today’s modern hard disk has a capacity of terabytes.
It is a portable memory device. It uses technology with all RAM except immutability. We also know it by the name of USB drive.
Blue ray disk
It is an optical storage media that is used to keep good quality videos and files etc. It uses small-scale optical rays. It can hold data up to 128 GB.
Virtual Memory is a method in which the RAM of a computer is increased with the help of software. By finding and using available disk space, the operating system swaps data between hard disk and physical memory. The benefit to the user is that Large applications programs can be loaded. More applications can be opened at one time. And programs have a lot of empty space to store data. Disadvantage of virtual memory is that the system operation slows down. And it gets bound in the free disk space of the memory system. Virtual memory can be used in all major operating systems.