Back when CD-ROM was a main thing, I remember that sometimes on games you could insert the CD, launch the game, and then remove the CD, the game would still run (I believe that was the case for Age of Empires 2 for example).
How was this possible?
In: 3
Reading data from a CD Rom had a noticeable delay compared to reading from a hard drive (CDs stop spinning when they’re not being read). Some games would store large media files on CD but most games copied all the game files to the hard drive during the installation process (so the game would run faster).
If the CD was needed to play the game it was often only there for a single copy protection check during the game start up, and once completed the CD wasn’t needed any longer.
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