With the release of Debian 9 (aka Stretch) fast approaching, Steve McIntyre has posted some changes coming to Debian's installation media. Most of the old, CD-sized images are being retired in favour of larger DVD images. "We used to make large sets of CDs, containing as much of the Debian archive as would fit. These sets were huge, and evidence over the years suggested they were rarely (if ever) used. Just about all current computers will use DVDs just as well as CDs, and they are much more convenient. Accordingly, we have now stopped making CD sets. Full
disc sets are still produced in DVD-sized images (for all architectures), and in Blu-Ray (BD) and dual-layer Blu-Ray (DLBD) images for amd64 and i386." CD-sized installation media will still be available for net-installs and the Xfce edition of Debian.