The compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony to store and play digital audio recordings. It uses the Compact Disc Digital Audio format which typically provides 74 minutes of audio on a disc.

2024年3月6日 · You will often read about "pits" on a CD instead of bumps. They appear as pits on the aluminum side, but on the side the laser reads from, they are bumps.

2019年11月26日 · 聚碳酸酯光盘包含一个称为“ 预刻槽 ”的螺旋凹槽（因为它是在将数据写入光盘之前成型的），用于在写入和读取信息时引导激光束。 预刻槽模制在聚碳酸酯圆盘的顶面，如果是上面提到的CD-ROM只读CD那么该位置处就是pits和lands；面向播放器或驱动器中的激光束的底侧平坦且光滑。 聚碳酸酯圆盘在沟槽前侧涂有一层非常薄的有机染料。 然后，在染料的顶部涂覆一层薄的反射银，银合金或金的反射层。 最后，将可光聚合漆的保护层涂在金属反射器的顶 …

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

2023年10月19日 · 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 …

Compact disc manufacturing is the process by which commercial compact discs (CDs) are replicated in mass quantities using a master version created from a source recording. This may be either in audio form (CD-DA) or data form (CD-ROM). This process is used in the mastering of read-only compact discs.

The inner face of CDs is scored with pits several micrometers long, which are arranged in a continuous spiral, and represent recorded data. Laser light is focused on these pits, and data is read by picking up the reflected light. DVDs work according on essentially the same principle.

2011年10月31日 · Through this short article we will discuss what this burning means and how actually data is written on the CD. The surface of a CD is made of a polycarbonate layer with molded spiral tracks on the top. The data are stored on the CD as a series of minute grooves which are known as ‘pits’ encoded on these spiral tracks.

In a compact disc player, a laser beam must track a spiral row of pits which are 0.5 micrometers wide with track spacing 1.6 micrometers. Tracking is aided by a three-beam laser arrangement.

Inside a CD is a flat light reflecting layer called "land". On the land are many "pits" written in a spiral-shaped track. From the read lasers point of view, the track spiral goes outwards when the disk rotates counter-clockwise. The spiral has a pitch of 1600 nm.