# Do CDs have grooves?

## Do CDs have grooves?

CDs are easily scratched, and should never be cleaned with just any cloth. CDs should be cleaned radially: not along the grooves, but at right angles to the direction of the grooves. If a smear, however small, should remain on the CD, running along the direction of the grooves, much information would be lost.

How wide are the tracks on a CD?

Schematic of a CD sprial The figure on the right illustrates this pictorially but is it not to scale: the track is very narrow and very long. Specifically, the track is standardized and is 0.5 microns or 500 nm across, but if stretched out onto a straight line it is about 5 kilometers (about 3.5 miles) long!

### What is CD storage?

A compact disc is a portable storage medium that can be used to record, store and play back audio, video and other data in digital form.

Do CDs play from Centre to edge?

Read by a red-light laser beam, the CD plays from the centre to the edge, rotating at a speed varying from 400 times a minute at the beginning to 250 times a minute at the end. This is equivalent to flying round the earth one inch above the surface, up to 400 times a minute, counting every blade of grass on the way.

#### Why are CDs the size they are?

The original target storage capacity for a CD was one hour of audio content, and a disc diameter of 115 mm was sufficient for this, however both parties [Sony and Philips] extended the capacity to 74 minutes to accommodate a complete performance of Beethoven’s 9th Symphony.

Do CDs play from the Centre outwards?

The games are written from the outside of the DVD-9 discs to the inside, meaning that most discs will actually have the majority of their data stored around the outer perimeter of the disc.

## How to measure the spacing of grooves on CD?

Here, we will try to use this process with laser wavelength to measure the spacing of grooves on CD. The formula for the groove spacing, d, is An = angle between the incident light and the diffracted beam forming the nth fringe.

How far apart are the tracks on a CD?

The distance between tracks was 1.6 μm. (1 μm = 10 −6 m). Most of the CD’s that we listen to right now are enhanced. These new specialized CD’s are compatible with both audio CD players and properly configured multimedia ROM’s.

### What is the groove spacing called?

The groove spacing is also called the “track pitch”. It is the distance between each track. Here is a list of the track pitches of some common formats. Type ——– Capacity —————Track pitch ———-Wavelength of laser light——Numerical Aperture

What is the track pitch on a CD DVD or Blu-ray?

What is the track pitch or groove spacing on a CD DVD or Blu-ray? – Answers The groove spacing is also called the “track pitch”.