2000年10月25日 · Like a CD, the data on a DVD is encoded in the form of small pits and bumps in the track of the disc. A DVD is composed of several layers of plastic, totaling about 1.2 …

2019年11月26日 · 从图片可以看到有很多小的坑（pits），称为数据坑，而数据就是藏在这个里面，每个pit的深度约为100 nm，宽为500 nm，长度从850 nm到3.5 µm不等，不同的长度就代表 …

1999年8月30日 · A DVD similarly stores and plays information based on a particular "dot pattern" on its surface. A very precise laser burns these dots--actually, incredibly small pits--on to the …

The 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 …

2010年3月16日 · DVD-Pits. At the inner layers of the plastic, the bumps and pits are covered with the help of a reflective aluminium layer. But their outer layers are protected with the help of a …

The minimum pit length of a single layer DVD is 0.4 micron as compared to 0.834 micron for a CD. With the number of pits having a direct bearing on capacity levels, DVD’s reduced track …

DVDs use a shorter-wavelength, red laser that can place pits more densely on the surfaces of the disks. This not only allows for more data, it also requires that the disks be only half as thick as …

As its name implies, the data layer of CDs and DVDs is the layer that contains the data. The data appear as marks or pits that either absorb light from the laser beam, or transmit the light back …

2023年10月19日 · A DVD is an optical disc that uses light to read and write the stored data on a flat disc. Data is stored on a thin and long spiral track running around the disc. In a read-only …

2023年9月28日 · When you write data onto an optical disc, such as a CD or DVD, the information is encoded using a laser. The laser burns pits and lands onto the surface of the disc, …