What is CD ROM?
A CD-ROM, which stands for Compact Disc Read-Only Memory, is an optical disc with audio or software data that has read-only memory. The tool that is used to read data from it is a CD-ROM drive or optical drive. The speed of a CD-ROM drive can range from 1x to 72x, which means it reads the CD roughly 72 times faster than the 1x version. These drives can read and play data from CDs, including CD-R and CD-RW discs, as well as audio CDs, as you might expect.
Note: A DVD, including a data or movie DVD, cannot be read by a CD-ROM player. A CD-ROM drive is not made to read the format of a DVD because it differs from a CD. A DVD can only be read using a DVD-ROM drive.
Independent researchers in the United States, such as David Paul Gregg (1958) and James Russell, produced the first theoretical studies on optical disc storage (1965-1975). Gregg's inventions, in particular, served as the foundation for the LaserDisc specification, which was jointly created by MCA and Philips after MCA bought Gregg's patents and the business he formed, Gauss Electrophysics. The LaserDisc was the CD's direct predecessor; the main distinction between the two was how information was encoded-LaserDisc used analog encoding, whereas CDs utilized digital encoding.
With the release of the PC Engine CD-ROM2 (TurboGrafx-CD) in 1988, CD-ROMs were first employed in home video game consoles. By the end of the 1980s, personal computers also received CD-ROM drives. In 1990, Data East showed off a board for an arcade system that accepted CD-ROMs. This board was reminiscent of laserdisc video games from the 1980s but used digital data, giving it greater flexibility than older laserdisc games.  Early in 1990, Japan sold roughly 300,000 CD-ROM drives, while the US was producing 125,000 CD-ROM discs each month at the time.  Due to the inclusion of a CD-ROM drive, which permitted the transport of several hundred megabytes of video, picture, and music data, several computers sold in the 1990s were referred to as "multimedia" computers.
Do you have a CD drive on your computer?
Disk drives are no longer present in contemporary computers (CD drives). Look at the front of your computer to see if it has a CD drive. A CD-reading slot or tray should be located on the front of the computer. If you can't see a CD drive, check your computer's disks to see if your operating system displays one.
Your computer lacks a CD drive if there is no disc drive visible. However, a desktop computer can be equipped with a CD drive, and a laptop or desktop can be connected to an external CD drive.
How to start a CD-ROM drive and shut it down?
If you click the tray eject button on the front of the drive, a CD-ROM drive will automatically open. Repeatedly pressing the tray or eject button will shut the CD-ROM drive.
If the eject button is not functioning, you can access My Computer or "This PC" in later versions of Windows to open or eject the tray. Locate the drive list in My Computer, right-click the CD-ROM drive, and then choose Eject from the pop-up menu. Another way to manually access a CD-ROM drive is to slide the paperclip's point through the eject hole in the drive. Gently push it in until resistance is encountered, then slightly press in to engage the release mechanism. In the event that everything is done correctly, the tray should be slightly open, allowing you to gently remove it with your fingertips. If a CD becomes stuck in the CD-ROM drive, manually opening or ejecting the tray may be helpful.
CD-ROM and disc drive interfaces
The various interfaces that enable a computer to connect to a CD-ROM and other disc drives are listed below.