In the IT world, “coaster” is most commonly used to describe non-functional compact discs or DVDs. One of these discs that has been damaged or written to improperly, or ruined while burning, does not present data, and is thus useless. The idea is that one can use it for a coaster for a drink, but not much else.
Dale Janssen is a co-founder of Techopedia and has been involved in the IT Industry for most of his career. He purchased his first computer in 1978 - an Ohio Scientific computer with a whopping memory size of 48K, operating a relic of an operating system called CPM. In fact, his roots go so far back in the computing biz that when he graduated from university, there was no such thing as a computer science department. Full Bio
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