How Optical disk data Read/Write operation happen ?
Optical disks, such as CDs, DVDs, and Blu-ray discs, use laser technology to read and write data. The process involves several steps:
Data Encoding: Before the data can be stored on an optical disk, it needs to be encoded. This is usually done using a process called "pits and lands" or "bumps and flat areas." The data is represented by a series of bumps or pits on the surface of the disk, which the laser can read. Writing Data: When writing data to an optical disk, a laser is used to create the bumps or pits on the surface of the disk. The laser is focused on a small spot on the surface of the disk, and the intensity of the laser is modulated to create the bumps or pits. The laser is usually very precise and can create bumps or pits that are less than a micrometer in size. Reading Data: When reading data from an optical disk, a laser is used to scan the surface of the disk. The laser is directed at the surface of the disk and reflected off the bumps or pits. The reflected light is then collected by a detector and converted into an electrical signal, which is interpreted as data. Error Correction: Optical disks use error correction codes to ensure that data is read correctly. These codes allow the laser to detect and correct errors that may occur during the reading process. If the error cannot be corrected, the drive may retry reading the data or report an error to the user. Overall, optical disk data Read/Write operations are achieved by precise laser technology and error correction codes, ensuring the accurate storage and retrieval of data.