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dvdisaster applies an image-based approach to data recovery. It does not apply a file-based data recovery, as reading a defective medium at the file level means trying to read as much data as possible from each file. But a limitation of the file-based approach arises when data sectors are damaged which have book-keeping functions in the file ...
Compact disc bronzing, or CD bronzing, is a specific, uncommon variant of disc rot, a type of corrosion that affects the reflective layer of compact discs and renders them unreadable over time. The phenomenon was first reported by John McKelvey in the September/October 1994 issue of American Record Guide .
Disc rot is the tendency of CD, DVD, or other optical discs to become unreadable because of chemical deterioration. The causes include oxidation of the reflective layer, reactions with contaminants, ultra-violet light damage, and de-bonding of the adhesive used to adhere the layers of the disc together.
AOL's Search and Recover can assist you in locating any lost files or folders that may have been mistakenly deleted. Search and Recover is able to perform recoveries for many digital media and devices including cameras, music players, CDs, DVDs, memory cards and flash drives. Please note that solid state drives aren't covered. Additional info
CD-Cops Requires the user to enter CD-code (or reads embedded CD-code) that describes geometry of CD to correctly locate data on the disc. SafeDisc (versions 1–5) Adds unique digital signature at the time of manufacturing which is designed to be difficult to copy or transfer so that software is able to detect copied media. SafeCast
A CD drive can have extraction errors when the data on the disc is not readable due to scratches or smudges. The drive can compensate by supplying a "best guess" of what the missing data was, then supplying the missing data.
SpinRite attempts to recover data from drives that the operating system cannot read. When the program encounters errors reading data, it tries to read the sector up to 2,000 times, in order to determine, by comparing the successive results, the most probable value of each bit. [4]
CD-R, DVD-R, DVD+R, CD-RW, DVD-RW, DVD+RW and DVD-RAM discs are all affected by exposure to ambient heat as well as heat build-up due to direct sunlight. A CD-R's data layer is made of dye that degrades at high temperatures, becoming less transparent so that pits and lands are read incorrectly, making the data unreadable.
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