Jvoulait pas dire de bétise mais ses même dans le fichier patch.txt dans les dossier du jeu :
If all required Diablo 2 '.MPQ' files are installed on the
hard drive, the game will no longer require the CD to play.
For users that originally performed a 'Full Installation'
and wish to run without the CD, all '.MPQ' files should
be copied from the Diablo 2 CDs to the Diablo 2 directory.
Most users will only need to copy D2Music.mpq from the
Diablo 2 Play CD and/or D2xMusic.mpq from the Lord of
Destruction CD. Mac users will need to copy these music
files and rename them to 'Diablo II Music' and
'Diablo II Expansion Music' respectively.