Skip to main content

Storage devices in detail

Hello, welcome back. In my last blog, I told you the basics of storage devices. Now, I am going to go into a little depth about each type of storage devices.

Optical storage
Optical storage is the storage of data on an optically readable medium. Data is recorded by making marks in a pattern that can be read back with the aid of light, usually, a beam of laser light precisely focused on a spinning optical disc. An older example of optical storage that does not require the use of computers, is microform. There are other means of optically storing data and new methods are in development. An optical disc drive is a device in a computer that can read CD-ROMs or other optical discs, such as DVDs and Blu-ray discs. Optical storage differs from other data storage techniques that make use of other technologies such as magnetism, such as floppy disks and hard disks, or semiconductors, such as flash memory and RAM.Optical storage can range from a single drive reading a single CD-ROM to multiple drives reading multiple discs such as an optical jukebox. Single CDs (compact discs) can hold around 700 MB (megabytes) and optical jukeboxes can hold much more. Single-layer DVDs can hold 4.7 GB, while dual-layered can hold 8.5 GB. This can be doubled to 9.4 GB and 17 GB by making the DVDs double-sided, with readable surfaces on both sides of the disc. HD DVDs were able to store 15 GB with a single-layer and 30 GB with a dual-layer. Blu-ray discs, which won the HDTV optical format war by defeating HD DVDs, can hold 25 GB for single-layer and 50 GB for dual-layer.
Image result for CD
Magnetic storage
Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetisation in a magnetisable material to store data and is a form of non-volatile memory. The information is accessed using one or more read/write heads.
As of 2017, magnetic storage media, primarily hard disks, are widely used to store computer data as well as audio and video signals. In the field of computing, the term magnetic storage is preferred and in the field of audio and video production, the term magnetic recording is more commonly used. The distinction is less technical and more a matter of preference. Other examples of magnetic storage media include floppy disks, magnetic recording tape, and magnetic stripes on credit cards.
Image result for hard disk
Solid-state storage
Solid-state storage (sometimes abbreviated as SSS) is a type of non-volatile computer storage that stores and retrieves digital information using only electronic circuits, without any involvement of moving mechanical parts. This differs fundamentally from the traditional electromechanical storage paradigm, which accesses data using rotating or linearly moving media coated with magnetic material.
Solid-state storage devices typically store data using electrically-programmable non-volatile flash memory, although some devices use battery-backed volatile random-access memory (RAM). Lacking any moving mechanical parts, solid-state storage operates much faster than traditional electromechanical storage; as a downside, solid-state storage is significantly more expensive and suffers from the write amplification phenomenon.
To satisfy the requirements of applications in various types of computer systems and appliances, solid-state storage devices come in various types, form factors, storage-space sizes, and interfacing options.
Image result for USB

Thank you for reading. Stay tuned to find out more!

Please comment! (I really need them...) 

Disclaimer: This content has been taken from Wikipedia and may be subject to copyright.

Comments

Post a Comment

Popular posts from this blog

Introduction to storage devices

WHAT IS A STORAGE DEVICE? A storage device is a device on which data can be stored. A very common example is a USB memory stick, or simply, a USB. TYPES OF STORAGE DEVICES Magnetic storage devices A magnetic storage device is a storage device that stores data using tiny magnetised dots. These dots are created, read and erased using tiny electromagnets. Examples: Hard disk (magnetic disc) magnetic tape floppy disc etc... Optical storage devices An optical storage device is a storage device that stores data using a laser beam. Holes are formed in the storage medium (device) that are read using a laser beam. Examples: CD disc DVD disc Blu-ray disc etc... Solid-state storage devices A solid-state storage device is a storage device that stores data using no moving parts. It uses flash memory. This is the same tech used in USBs. Examples: USB memory stick Smart cards SD cards etc... Thank you for reading. Stay tuned to find out more! Ple...
1 comment
Read more

Basics of HTML

HTML HTML is a markup language designed to create webpages and websites. It stands for H yper T ext M arkup L anguage. It is non-case sensitive, which mean <HTML>, <HtMl>, <html> and <HtmL> are the same thing. In this blog, you will learn the basics of HTML. We need a software to write the codes. There are two types, WYSIWYG editors and text editors. WYSIWYG editors are based on what we see. WYSIWYG stands for W hat Y ou S ee I s W hat Y ou G et. Text editors need HTML tags. We will be using notepad which is a text editor. It does not need to be installed, it is built-in every computer. See (Win 7) Start > All programs > Notepad. Its icon looks like this:- HTML tags HTML is a language based on tags. A tag is a keyword within angle brackets. For example, an HTML tag will be written as <HTML>. There are two types of tags, container tags and empty tags. A container tag has a start AND an end, but empty tag has only the start.<Body...
Post a Comment
Read more

Main HTML tags

Hello, welcome back. In my last blog, I told you the basics of HTML. Now, I am going to go into a little depth about each tag in HTML. HTML tag HTML tag is the first tag to be written. It opens the document and is the most essential. It is a container tag that ends as the last tag to be closed.  Head tag The head tag is the second container tag. It specifies the heading of the document. It can be left out but it is still useful. Heading size To specify the size of the heading, we use the <h1>, <h2>, <h3>, <h4>, <h5> and <h6> tags. <h1> is biggest and<h6> is the smallest. It is a container tag.  Title tag The title tag is another tag that is used inside the head tag. It specifies the text to be written on the title bar of the web browser. It is a container tag. Again, it can be left out. Body tag The body tag tells where the real content of the webpage starts. It is the last main tag. It is...
Post a Comment
Read more