The metal disc used to make a coin is called a "coin blank" or, more formally, a "planchet." They also used to be called "flans," but that term is no longer as widely used.
The tiny dots in a satellite image are called pixels. Each pixel represents a specific color or brightness level and together they form the image that we see.
pixels
Compact discs (CDs) are made of polycarbonate material and have a reflective metal layer where data is stored as tiny pits or dark spots created by a laser. When the CD is read by a laser in a CD player, the pits reflect light differently, allowing the player to interpret the data encoded on the disc.
All digital data is represented as one's and zero's. The actual physical representation of data on an optical disc - assuming you are talking about CD's - is called pits and lands.
CD data is stored as a series of tiny indentations known as "pits", encoded in a spiral track molded into the top of the polycarbonate layer.
dents
These indentations are called caveolae. They are flask-shaped invaginations of the plasma membrane that play a role in various cellular processes, such as signal transduction and vesicular trafficking.
The triangular indentations used for the script of Sumerians is called cuneiform.
Dimples
Dimples.
The DVD was a development rather than an invention. It was a high density version of the Compact Disc that was the first of the low cost optical storage devices. Similarly, the Bluray disc is a higher density version of the DVD. The CD itself was a development of optical technologies with low power highly controllable lasers and plastics molding allowing CDs to be printed with accurate, tiny indentations. However, as the CD was the first of its kind, it can certainly be called an invention and so was the invention that lead to the DVD and then the Bluray discs.
scratches are indents in the disc or where a tiny part of the disc is gone. they cannot be taken off, for they are not a physical object attached to the disc.
Advantages - NoneDisadvantages - TINY TINY TINY Storage- Rubbish size/storage ratio (size of disc)- they are obsolete surelyI built a new PC and didnt include a disc drive because they are pointlessfor the price of a disc drive you can get a 8 gig USB stick
You mean indentations. A business letter that is not indented is in block from.
If you were to look at the shiny part of a disc under a microscope, you'll see that its covered with little dents (called pits, which are small indentations on the surface). The smooth parts of the disc between the pits are called lands.See image: http://www.sonic.net/~ideas/art_mma3.htm…When a laser is shone on the disc and the disc is spun, the smooth parts of the disc, called the 'lands' bounces the laser back onto the sensor.Everytime this happens, it registers as a "1" in computer binary code.However, as it hits a pit (dent), this disrupts the laser beam and thus the laser misses the sensor in the disc drive.This registers as a "0" in binary code.As the disc spins, a sequence of 1's and 0's is produced by the 'pits' and "lands" is produced. The computer analyzes this code and then turns it into data.
A flat disc of cheese is called a wheel.