What is Storage Device? Types of Storage device

Storage Devices

A storage device, also known as memory, is a computer device where computer stores data either temporarily or permanently. Other terms for storage device are storage media, storage medium. There are mainly two types of storage devices: Primary Memory and Secondary Memory.

All the computers today come with RAM and ROM as the primary memory and Hard disk as secondary memory. RAM, Pen drive, Memory card, DVD are few examples for storage devices.

Types of Storage Devices

Primary Memory – The primary memory in a computer are also known as internal storage; they are also called as main memory of the computer. A computer cannot run without primary memory. RAM and ROM are the primary memory of a computer.

Secondary Memory – The default secondary memory in a computer is hard disk. Other terms for secondary memory are secondary storage device, external storage device, external memory. A computer can function without secondary memory, however, operating systems like Windows OS require larger storage space for installation so all the computers come installed with an internal hard disk.

Popular Storage Devices

ROM – Read Only Memory or ROM is a type of primary memory that comes with the computer. The computer manufacturer stores its information like company name, logo, build date etc. in the ROM. The information stored in a ROM is for permanent period and so they are also called as non-volatile memory.

computer rom

During computer manufacturing, the manufacturer stores its brand logo, name, computer build information in the ROM. Even if you format the computer, this information is not deleted. You cannot delete the information stored in ROM.

RAM – Random Access Memory or RAM is also a type of primary memory. The data stored in a RAM is for temporary period and so called as volatile memory. The RAMs today are available with storage capacity of 2GB, 4GB, 8GB, 16GB.

The data in RAM is present till the computer is ON. When you restart or turn OFF the computer, the data present in RAM is deleted.

Hard Drive Disk (HDD) – A hard disk is the only secondary storage device that comes installed internally with the computer due to the large storage space required by operating system. However, there are external hard disk as well that you can connect with your computer through USB device.

The storage capacity of a hard disk is very higher than RAM. You can get hard disks today with storage capacity of 128GB, 256GB, 500GB, 1TB, 2TB.

Pen drive – A pen drive, also known as USB drive or a Flash drive, is a type of external storage device. Pen drives today are available with storage capacity of 1GB, 2GB, 4GB, 8GB, 16GB, 32GB, 64GB, 128GB and 256GB. They are so small in size that you can keep them in your shirt’s pocket or even in your wallet.

Memory Card – A memory card is also a type of external storage device that a computer reads using a memory card reader. There are two types of memory card available: SD Card and Micro SD Card.

memory card figure

Most of the laptops today already has a built-in memory card reader so you just have to insert the memory card into it to either transfer data from computer to the card or access the data stored in the card. The storage capacity of memory cards is similar to pen drives today, however; they are smaller in dimension.

DVD – Like CDs, DVDs are also circular discs that we all use to store data. DVD stands for Digital Video Disc or Digital Versatile Disc. Due to large storage capacity of DVDs, CDs are not much used today. Where a CD has 700 MB size, a DVD can store 4.7 GB of data and the dual layered DVDs can store 8 GB of data.

I hope this article was helpful enough to give you an idea about storage devices and its types. I would recommend you to subscribe our YouTube channel – LM Skills Academy and also follow us on Instagram @lmskillsacademy for more learning.

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