Secondary Memory

Secondary Memory of Computer

In this tutorial you learn about secondary memory of the computer. Computer have two types of memory Primary Memory and Secondary Memory. If you haven’t read about primary memory then learn about “Primary Memory“.

Here you will learn what is Secondary Memory? Types of Secondary Memory with examples.

What is Secondary Memory?

Secondary memory stores data on a long-term basis. It cannot be processed directly by the CPU. It must be copied into primary memory storage. Secondary memory devices include magnetic disk like hard drives and floppy disks, optical disk such as CDs and CDROMs, USB Flash Drives and magnetic tapes, etc.

Types of Secondary Memory

Types of Secondary Memory of Computer

Here are given some types if the secondary memory of the computer, such as Hard drive, Floppy Disk, CD-ROM, DVD, CD, HVD, Zip Disks, Blue Ray Disc, etc.

Hard Drive –

It is a non-removable storage device containing magnetic disks or platters rotating at high speeds. The hard drives store data in segments of concentric circle. It may spin the data at 5,400 to 15,000 RPM. Hard Dive is invented by IBM Teams, Reynold B. Johnson.

Compact Disks (CD) –

A Compact Disks is a portable storage medium that can be used to record the data, store in the digital form. They are fragile and prone to scratches. The readable surface of a compact disks includes a spiral track wound tightly enough to cause light to diffract into a full visible spectrum. CD was developed by Philips and Sony.

Floppy Disk –

Floppy Disk is composed of a thin, flexible magnetic disk sealed in a square plastic carrier. Floppy disks were widely used to distribute the software, transfer files, and create backup copies of data. To read and write data a floppy disk, a computer system must have a floppy disk drive (FDD). The floppy disk drive invented and made by IBM, had a disk diameter of 8 inches (203.2 mm).

Blue-ray Disc –

Blue-ray Disc is upgraded version of the CD and DVD discs and Drives. It is commonly known as BD-ROM. The maximum capacity of BD discs is 25GB if single layer and if dual layer its capacity us 50 GB.

Digital Video Disc (DVD) –

It is a device currently used to store large amount of data and accepts heigh definition material. A two layered DVD can hold approximately 17 GB of video, music and other data.

DVD was invented in 1995 and it was developed by group of companies the following companied are Sony Corporation, Panasonic, Toshiba and Philips.

Compact Disc Read-only Memory (CD-ROM) –

The CD-ROM is a per-pressed optical compact disc that contains data. It is a storage device that can read the data but can’t change and delete it.

The CD-ROM was developed by “James Russell” in the mid-1960.

Flash Drives –

Flash drives are small, ultra-portable storage device. They connect to computer and other devices via a built-in USB plug. They are often referred to as pen drives, thumb drives, or jump drives. Mostly its storage capacity is 8 GB to 64 GB. The Flash Driver was developed by “Dov Moran and M-Systems“.

Zip Disks –

An advanced version of the floppy disk is known as Zip Disks. It was developed by “Iomega. Storage of Zip Disks are available in 100 MB and 250 MB and 750 MB capacity and they are used to store, share and backup large amount of data.

Virtual Memory –
Virtual Memory permits software to use additional memory by utilizing the Hard Disk Drive (HDD) as temporary storage.

Cache Memory – It is a very high- speed semiconductor memory which can speed up the CPU. It acts as a buffer between the CPU and main memory. Example; Registers.

Types of Memory with Examples;

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