There were a number of Sega Mega CD models and bundles released over the system's lifespan. This page attempts to document them all. It does not include hybrid or special systems such as the Aiwa Mega CD, Wondermega, Multi-Mega etc.
Japan
Mega CD
Mega CD, JP
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Console
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Mega CD, JP
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Cover
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Console
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Mega CD 2
Mega CD 2, JP
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Console
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United States
Sega CD
Mega CD, US
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Console
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Mega CD, US
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Cover
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Console
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Sega CD 2 (Action System)
Mega CD, US
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Console
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Canada
Canada's consoles are identical to their US counterparts, but their packaging has French translations.
Mega CD, CA
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Console
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Europe
Mega CD, EU
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Cover
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Console
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Mega CD II
Mega CD II, EU
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Cover
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Console
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Mega CD, EU
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Cover
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Console
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Mega CD, EU
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Cover
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Console
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Spain
Spain did not receive the original Mega CD, but it did receive the redesigned Mega CD II before the Mega Drive II.
Mega CD II, ES
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Cover
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Console
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Portugal
Mega CD II, PT
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320x80px Cover
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Console
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Brazil
Sega CD
Tectoy were once again responsible for the distribution of the Mega CD in Brazil. There were no "Model 1" types sold in the country, so the company took the North American Sega CD Model 2 and simply branded it the "Sega CD". It is more than likely that the software is interchangeable.
Sega CD, BR
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Console
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Sega CD, BR
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Cover
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Console
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Mega CD, BR
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Console
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Sega CD, BR
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Cover
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Console
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South Korea
CD Aladdin Boy II
CD Aladdin Boy II, KR
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Console
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