System recognizes default "root path" in an .inf file as A:

Hi.

I want to package drivers files of an media card into an EXE made by InstallShield. The raw drivers files contain an .inf, some .dl_ zip files and so on. I set the section [SourceDisksNames] in the inf as "some name,,," (blank in the directory placeholder for the default root path). As described in MSDN, the system should recognize the default root path as the same of the inf file.

I tried to put the .inf file into the \WINNT\inf\ directory together with all other files, plugged in the card, and the system found it and began to search other files defined in the [SourceDisksFiles] section. But the system thought that the path should be A:, not the same path as the inf. What should I do to correct this? Thanks for any help.