CD-R stands for "Compact Disc-Recordable", a widely used storage medium that allows users to record data onto a disc once and read it multiple times. Introduced in the early 1990s, CD-Rs became a revolutionary technology for personal data storage. It introduced in the early 1990s, CD-Rs became a revolutionary technology for personal data storage, enabling users to create their own music compilation, backup essential files, and share in the portable format.
Compact Disc – Recordable
It is a digital optical disc storage format which was introduced in 1988. CD-R is a type of compact disc that can be written only once. It can be read many times. It is made of a reflective metal disk with a layer of green or opaque bye on top. It is a blank CD in which data can be stored once and after storing data it is converted into CD-ROM. Most plain CD readers can read CD-R disks. CD readers can also read it manufactured before the introduction of CD-R.
History
CD-R was initially called CD-WO (Compact Disk - Write Once). It was first developed by Philips and Sony in 1988. The specification of CD-R were published in Orange Book in the same year. Later on in 1990 it was completely in market.
Writing to a CD-R
A single tracks runs in spiral pattern from the center of the disc to the side.
- A high powered laser is shone onto CD-R, changing the transparency of the dye above. The transparent represents the ones and opaque represents zero.
- The disc Continues to spin and the laser follows the track. It puts the binary data onto CD-R in a spiral track.
- Finally the data has been written.
Reading From a CD-R
A single track runs in spiral pattern from the center of the disc to the outside.
On the surface of the disk a low-powered laser is shone and the reflection is captured in a photodiode sensor. The opaque dye will reflect differently to the transparent dye meaning it can tell the difference between one and zero.
- The disc continues to spin and the laser follows the track.
- The binary data are put together and the CD-R has been read.
Advantages
- It is less costly.
- It can be read by any CD player.
Disadvantages
- Seek time in CD-R is slow.
- Data degrades with time.
- Data can not be written over in CD-R.
Conclusion
CD-R (Compact Disc Recordable) was a significant advancement in optical storage technology, allowing users to write data onto a disc once, unlike CD-ROMs. It become popular medium for personal data backup, music, and file sharing, giving individuals the ability to create their own CDs. Although the data on a CD-R cannot be erased or rewritten, it offered flexibility and accessibility in a time when writale media were limited. However, like CD-ROMs, CD-R have become largely obsolete with the rise of USB drives, cloud storage, and more advanced digital storage options that offer greater capacity , speed and reusability.
Similar Reads
CD full form The compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony to store and play digital audio recordings. It uses the Compact Disc Digital Audio format which typically provides 74 minutes of audio on a disc. In this article we are going to study about
4 min read
Difference between CD-R and CD-RW From early generations of computers, computer storage is possible with the help of punched cards, magnetic tape, disk drives, floppy disks, and memory sticks. In the 1990s optical data storage was introduced for storing large amounts of data. Its types are compact discs, digital versatile discs, and
5 min read
Introduction of Compact Disk (CD) optical memory Optical memory is a type of electronic storage medium that stores and retrieves data using a laser beam. If we categorize memory systems, optical memory falls under external memory in a computer system. There are numerous forms of optical memory. What is Optical Memory?Optical memory is a form of el
5 min read
Cd cmd command Cd is the abbreviation or synonym for chdir. It is a command found inside the Windows Command Processor (cmd) that allows for change of the current working directory of a shell instance. The CWD (Current Working Directory) is a path (of a directory) inside the file system, where the shell is current
3 min read
How to Use setwd and getwd in R? In this article, we will discuss how to use setwd and getwd in the R programming language. getwd() function getwd() stands forget working directory. It is used to get the current working directory of the environment. Syntax: getwd() We can also see the total number of files in the present working di
1 min read
CD-RW Full Form CD-RW stands for (Compact Disc-ReWritable). It is a digital optical disc storage format introduced in 1997. It provided further competition to the various superfloppy alternatives. Ideal use is for test discs, temporary backups, and as a middle-ground between online and offline storage schemes. A CD
3 min read