Compact disc - Wikipedia
WEBPits and Lands of a compact disc under a microscope. CD data is represented as tiny indentations known as pits, encoded in a spiral track molded into the top of the polycarbonate layer. The areas between pits are known as lands. Each pit is approximately 100 nm deep by 500 nm wide, and varies from 850 nm to 3.5 μm in length. [72]
What are Pits and Lands in CD’s - Computer Notes
WEBAll Optical media (CD, DVD, Blu-Ray etc.) have pits and lands. These are microscopic and represent the binary information of the data stored on the disc. A land is reflective and reflects the laser into a sensor to register it as a I, but when the light hits a pit, it shatters and no reflection is received, thus a O is registered. To write 1 ...
When Were CDs Invented, and How Do They Work? | HowStuffWorks
WEBMar 6, 2024 · It employed a laser to read information encoded in tiny pits etched into the surface of the disc, a method that was revolutionary, providing users with unprecedented sound clarity and fidelity.
CD-ROM - Wikipedia
WEBA CD-ROM (/ ˌsiːdiːˈrɒm /, compact disc read-only memory) is a type of read-only memory consisting of a pre-pressed optical compact disc that contains data computers can read, but not write or erase.
How do CD and DVD players work? - Explain that Stuff
WEBFeb 17, 2022 · The laser (red) flashes up onto the shiny (under) side of the CD, bouncing off the pattern of pits (bumps) and lands (flat areas) on the disc. The lands reflect the laser light straight back, while the pits scatter the light.
How Does A Compact Disc (Or DVD) Work? - Science ABC
WEBOct 19, 2023 · Data on a CD is encoded with the help of a laser beam that etches tiny indentations (or bumps, if you will) on its surface. A bump, in CD terminology, is known as a pit, and represents the number 0. Similarly, the lack of a bump (known as a land) represents the number 1.
Methods and Materials: CDs and DVDs | Ismail-Beigi Research Group
WEBThe bright “pills” are the pits. The only real difference between the CD and DVD is that everything for the DVD is smaller: narrower and shorter pits and a smaller pitch to pack everything in more tightly.
CD-ROM | Definition & Facts | Britannica - Encyclopedia Britannica
WEBSep 4, 2024 · CD-ROM, type of computer memory in the form of a compact disc that is read by optical means. A CD-ROM drive uses a low-power laser beam to read digitized (binary) data that has been encoded in the form of tiny pits on an optical disk. The drive then feeds the data to a computer for processing.
Why is it more reliable to use the land/pit transition in a CD-ROM?
WEBI was reading about how CD-ROMs work and I came to this: Although it might seem simplest to use a pit to record a 0 and a land to record a 1, it is more reliable to use a pit/land or land/pit
CD-ROM Operations - Pctechguide.com
WEBThe areas around the pits, called lands, also play a part in the process. The reflected light passes through a prism and onto a photosensor, the output of which is proportional to the amount of light it receives.