Thor-CD

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Thor-CD was a recordable CD format proposed in 1988 by Tandy (parent company of Radio Shack), that was never released in commercial version.

At the time Tandy proposed the new format, CDs were mostly used for music, not for storing digital data. Tandy aimed to change this with its new format.

However, the introduction of the CD-ROM format, which was incompatible with Tandy's proposal, all but killed Tandy's product. It was also known in later years as Vapordisc, since it never made a commercial debut.