The System 7.5 Update 2.0 installer may not use all of the disks during installation. This is a normal behavior of the installer, and which disks are used depends on the type of computer and software you have pre-installed and whether you do an Easy or Custom Install.
This article was published in the Information Alley on 9 April 1996.
Article Change History:
09 Apr 1996 - Added keyword.