Discovery HD is the international name of the high-definition television channels from Discovery Communications. The international Discovery HD first launched in Korea on February 2005 as a programming block. In December 2005, Discovery HD Japan and Discovery HD Canada launched as 24-hour channels, becoming the 100th and 101st Discovery networks overall .

After this, Discovery HD expanded into other markets as follows: In Romania, Discovery HD will be launched in 2008. The first American HD Discovery channel has the name Discovery HD Theater, now just HD Theater and launched in June 2002.

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