All 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. There is much confusion as to which is a pit and which is a land, even some professional texts get it wrong, but this is the way I was educated.
Lands
Optical discs, such as CDs and DVDs, use pits and lands to store information. Pits and lands are variations in the physical surface of the disc that represent binary data (0s and 1s) which is read by a laser during playback.
Flats, or lands.
A compact disc (CD) stores data by using microscopic pits and lands in its middle layer called the polycarbonate layer. These pits and lands are read by a laser beam in order to retrieve the stored information.
The flat spots on a CD are called pits and lands. These pits and lands are etched onto the surface of the CD to store digital information in the form of binary code.
Pits and lands
Pits and lands
The recessed area on a CD or DVD where data is stored. CDs and DVDs store data in lands and pits. The lands represent 1 and the pits represent 0 in binary computing. The bits are read by the disc drive that uses a laser beam to distinguish between the lands and pits based on the amount of scattering or deflection that occurs when the beam of light hits the surface of the disc
Walnut Creek CDROM ended in 2000.
Walnut Creek CDROM was created in 1991.
Optical Storage Medium
dual layer means there are layers of pits and lands on the dvd