Quote:
Originally Posted by KathieK
45's, LP's, and 78's - refers to the revolutions per minute that a musical record makes around the player. 45's were the equivalent of today's single CD recordings...
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78's also usually only held one song, though at that high speed they were almost as large as a 33 +1/3 rpm album. Increasing data density on the
platter (another archaic term) allowed smaller disc sizes or additional audio storage for more songs. Wikipedia has a good description of audio recording history
here.
Increasing data density did not begin with audio recordings or the computer age, but has been a goal of mankind throughout history. A very interesting book on the subject is "The Race for Bandwidth: Understanding Data Transmission", written by Cary Lu.