From Fedora Project Wiki
- robatino - CD sizes are measured in MiB (so the size of a "700 MB" CD is actually closer to 700 MiB - see http://en.wikipedia.org/wiki/CD-ROM#Capacity), but DVDs are measured in GB (so a "4.7 GB" DVD is almost exactly 4,700,000,000 bytes - see http://en.wikipedia.org/wiki/DVD#DVD_capacity). I'm not sure about the minimum size - is it 2 MiB, or 2 MB?
- robatino - I've been told there's no specific minimum size, so it doesn't really matter.
- jlaska - I think this test has a larger focus on ensuring that the ISO's are not larger than the media for which they are intended (e.g. CD or DVD). However, a minimum size was also added so that we weren't shipping media with no packages. As is sometimes the case during the compose process, a disc6.iso can be produced which contains no packages. This is rare, but also something the disk size check was validating. Hope this helps!
- robatino According to http://en.wikipedia.org/wiki/Binary_prefixes#Flash_drives, the advertised size of USB flash drives is in SI units.