Coaster

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The Jargon File Parts of this article are based on the Jargon File, v. 4.4.7, a public domain document of hacker jargon.

coaster

Usage: n.

coaster: n.

1. Unuseable CD produced during failed attempt at writing to writeable or re-writeable CD media. Certainly related to the coaster-like shape of a CD, and the relative value of these failures. "I made a lot of coasters before I got a good CD."
2. Useless CDs received in the mail from the likes of AOL, MSN, CI$, Prodigy, ad nauseam.

In the U.K., beermat is often used in these senses.

Sources

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