CD

CD or "Compact Disc" is today the de facto standard for distribution of computer software. It consists of a record-like metal disc which has areas which do or do not reflect a laser beam which is focused on the metal surface; the disc itself is laminated in plastic. Recordable CDs can also be written with another type of laser. The CD is being replaced by the DVD, or "Digital Versatile Disc".

Another one of my old high-dollar Memorex CDs has failed and lost me some data. Mental note: never purchase Memorex optical media.

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CD

Read more about Is it dead, or is it Memorex?
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On Windows there are a slew of file recovery tools which will peer intently at an optical disc, retrying until they recover every possible file. The leading tool is probably Isobuster, but there are dozens of candidates for the title. There are few automated (or even user-friendly) data recovery tools on Linux or UNIX(tm) platforms, but common tools which are often even included with the core system or which are installable through the official package system are often sufficient for performing this critical task.