.discinfo files can be found on Fedora installation media and provide media information to Anaconda installer.
.discinfo is a plain-text file containing following fields, one value per line:
timestamp: float
release: str
architecture: str
disc_numbers: ALL or comma separated numbers
Fedora 21 Server.x86_64, disc_numbers: ALL:
1417653453.026288
Fedora Server 21
x86_64
ALL
Fedora 21 Server.x86_64, disc_numbers: [1, 2, 3]:
1417653453.026288
Fedora Server 21
x86_64
1,2,3