Insallation of SQL Server 2005 from Local Folder

If you are installing SQL Server from CD media dumps which is copied into a local/network folder (in SQL Server 2005 Installation CDs are Two where as in DVD media only one DVD) , the folders should be named as Servers and Tools for CD1 and CD2 respectively. Otherwise , client components and SQL Server BOL will not be installed. There will be error if you are not named the folder as above mentioned.

Ref : http://msdn2.microsoft.com/en-us/library/ms144259.aspx