What is an Optical Drive (Definition, Function, and Types)?

When it comes to CD drives, many young folks may not be very familiar with the term, as it has gradually vanished from recent laptop models. But fret not; this article will guide you through what a CD drive is, how it works, and the common types of CD drives. Let's get started!

[Definition] What is an Optical Disk Drive?

A CD drive, also known as a disk drive, ODD (Optical Disk Drive), CD-ROM, DVD drive, or BD drive, is a part of computer hardware that's used to read and write CDs, DVDs, and Blu-rays. It appears as a square box with a drawer. You can push the open/close button to eject and retract the tray door.

CD drives can be found in most desktop and laptop computers, though they have become less common in recent years.

A CD drive serves many purposes. It can be used to install systems, software, and games. Alternatively, it can serve as a storage medium for videos, audio files, documents, photos, and the like.

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【Function】How does a CD drive work?

A CD drive works by utilizing a laser diode to read data stored on an optical disc, which is represented by tiny pits and bumps. The rotation speed of the disc varies depending on its type and is typically measured in RPM (revolutions per minute). The CD drive also employs the laser diode to write data onto the disc by burning microscopic holes onto the surface of the optical disc.

Most drives can write or read CD/DVD/BD formats. Common formats include: CD-R (read-only), CD-RW (read/write), DVD-R, DVD-RW, BD-R, BD-RW, and so on.

[Types] Common Types of CD Drive

Optical disc drives (ODD) can be classified into internal and external types according to their connection method.

An internal CD drive is one that is built into the computer, and some laptops will have them as well, usually underneath the keyboard. Internal CD drives are installed within the computer and cannot be removed from it.

An external CD drive, as the name suggests, is one that isn't built into your desktop or laptop computer. You'll connect it to your computer with a USB or another type of cable. Most laptops these days are slimmed down and don't come with CD drives. If you need one, buy an external drive and connect it to your laptop with a USB, Type-C, Firewire, or Thunderbolt cable.

Summary

In short, an optical disc drive is a computer component used to read and write CDs, DVDs, and Blu-rays. It employs a laser diode to read and write data stored on optical discs. Optical disc drives can be categorized as internal or external, depending on their method of connection.

This article should help you understand CD drives a little better.