SourceDisksFiles Section

[SourceDisksFiles]
<filename>=<disk-number>[,<subdir>]
    .
    .
    .
 

Names the source files used during installation and identifies the source disks that contain the files.

filename
Name of the file on the source disk.
disk-number
Ordinal of the source disk that contains the file. This ordinal must be defined in the SourceDisksNames section, and must have a value greater than or equal to 1 (zero is not a valid disk-number parameter value).
subdir
Optional parameter that specifies the subdirectory on the source disk where the file resides. If this parameter is not used, the source disk root directory is the default.

This example SourceDisksFiles section identifies a single source file, SRS01.386, on the disk having ordinal 1:

[SourceDisksFiles]
SRS01.386 = 1