November 29, 2023

RepairCdDvD is a tool that recovers data from unreadable video cd movies/DVD. It can help you retrieve the files from damaged CD DVD and save them to disk, the clipboard, or even the hard disk. No accumulated cost if you need more than one type media or file system supported. RepairCdDvD is a highly specialized yet easy to use media data recovery tool. It supports all disc formats and all common file systems. Insert a disc, start up RepairCdDvD and select the drive or media (if not selected already) and let RepairCdDvD mount the media. RepairCdDvD immediately shows you all the partitions or tracks and sessions located on the media, combined with all file systems that are present.

This way you get easy access, just like explorer, to all the files and folders per file system. Instead of being limited to one file system that the OS picks for you, you have access. Access data from older sessions or hidden partitions, access data that your OS (e.g. Windows) does not see or hides from you etc. Combine this all-revealing functionality with far better read and recovery mechanisms, scanning for lost files functionality, workarounds for a wide range of drive and software bugs, limitations or shortcomings and you have an enormously powerful data recovery tool. RepairCdDvD is must-have-software for every PC user and is deliberately kept low priced to be able to offer a solution for everybody.

Structure of the medium, data recording Micrograph of recesses and fields Diagram of a cross-section of a pressed plate A standard compact disc, often referred to as an audio CD, stores the digital audio record in a “red book” standard to distinguish it from later variants. Compact discs are made of a 1.2 mm thick polycarbonate plate with a diameter of 12 cm, covered with a thin layer of aluminum (aluminum), in which information is contained (in the form of a combination of micro-grooves and places without them). They are read with a semiconductor laser (AlGaAs) with a wavelength of about 780 nm. The recording creates a spiral path from the center to the edge of the record.

The rotational speed of the plate is varied such that the linear speed of the read head with respect to the track is constant and for the reading speed x1 it is in the range of 1.2 to 1.4 ms. The disc is read from the center to the outside, and the rotational speed decreases as you move away from the center of the disc.

Before writing to disk, data is encoded in the “8 in 14” standard and stored in the form of land and pits. In the embossed plates, the recesses are 1/4 wavelength deep in the material of the reading laser plate (about 125 nm), as a result of the interference of light reflected from the environment and the recesses, the wave is extinguished. The pits are 500 nm wide and the track spacing is 1.6 mm. The differences in light reflection are used by the lens servo to guide the beam along the path and focus it.

The “8 in 14” coding system ensures that the smallest pit and land length is 3 bits (833 nm) and the longest 11 bits (3560 nm)

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