QA talk:Testcase Mediakit ISO Size

• 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.

• robatino For RC4, the exact size of F13-Beta-i686-Live-KDE.iso is 734003200 bytes. A zero-byte file of this size can be created with the command

dd if=/dev/zero of=dummy-file bs=2048 count=358400

Running the prescribed test on it shows a size of 701M, even though its exact size is 700 MiB = 700*1024^2 bytes. Are the KDE live images still supposed to be CD-sized, and if so, does this image pass the test, or not?

• robatino Informative post from the test list on exactly how much can fit on a CD: http://lists.fedoraproject.org/pipermail/test/2010-April/089943.html

In particular, it appears that an exactly 700 MiB image will fit.