SizeMe is described as 'Maximize your output!
SizeMe makes it possible to scan a directory and compare it to how many floppy/zip/CD-R/DVD-discs you need. (Many calls it spanning or span of elements over a medium). It tries to fill each disc up as much as possible, and gives you the result on each disc' and is an app in the cd/dvd tools category. There are three alternatives to SizeMe for Windows. The best SizeMe alternative is DiscFit, which is both free and Open Source. Other great apps like SizeMe are Ignition and Burn to the Brim.