CD-R

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CD-R logo

CD-R (Compact Disc-Recordable) is a type of digital optical disc storage format. A CD-R is a writable compact disc that can be written once and read arbitrarily many times. CD-R discs are readable by most CD-ROM drives and CD players.

History

The CD-R technology was introduced in the late 1980s and became widely available in the early 1990s. It was developed as an extension of the CD standard, which was originally designed for audio and data storage.

Technical Details

CD-Rs are made from a polycarbonate substrate, a layer of organic dye, a reflective layer, and a protective outer layer. The recording process involves a laser that changes the properties of the dye to create marks that can be read by a CD player or CD-ROM drive.

Recording Process

The recording process is known as "burning." During burning, a laser heats the dye layer, causing it to change its reflectivity. This change is detected by the CD player's laser, allowing it to read the data.

Capacity

A standard CD-R can hold up to 700 MB of data or 80 minutes of audio. There are also high-capacity CD-Rs that can store more data, but they are less common.

Uses

CD-Rs are used for a variety of purposes, including:

• Data storage
• Music recording
• Software distribution
• Backup of important files

Advantages and Disadvantages

Advantages

• **Compatibility**: CD-Rs are compatible with most CD players and CD-ROM drives.
• **Cost**: They are relatively inexpensive.
• **Durability**: Properly stored CD-Rs can last for many years.

Disadvantages

• **Write Once**: Data can only be written once; it cannot be erased or rewritten.
• **Limited Capacity**: Compared to other storage media like DVDs and USB flash drives, CD-Rs have limited storage capacity.

Related Technologies

• CD-RW (Compact Disc-ReWritable)
• DVD-R (Digital Versatile Disc-Recordable)
• Blu-ray Disc

See Also

• Compact Disc
• Digital storage
• Optical disc
• Data storage