The listing below is a report from `du' on the unix box the CD was pressed 
on. It gives info on how much space is in each directory. The numbers are 
expressed to the nearest kilobyte... 

xanadu> du -s * 
1      00readme.txt       448    0index.txt       320    0index8.txt
1      0sizes.txt         79436  8bit             41806  apps
10344  archiver           2648   cli              135862 demos
15075  diskutil           15391  editors          4728   emulator
141894 falcon             96054  games            87604  gnustuff
61045  graphics           254    info             2546   jaguar
29595  language           89214  linux68k         3553   lynx
6164   minix              122352 mint             4692   misc
8816   music              22389  network          11932  printing
31975  program            7864   prtfolio         100697 sound
18207  ste                33539  telecomm         24233  tex
2401   tt                 151    unzip.ttp        43135  utils            

xanadu> du -s /cdrom 
632553  /cdrom 
 
So you're getting 632 Mb of compressed information/data/programs. 
 
Enjoy, 
 
Simon.