Fraction of full ISO size: 56.9%
applydeltaiso's approximate running time (2-3 GHz CPU, 1-2 GiB RAM): 45 minutes

This deltaiso file allows one to generate the Fedora-11-x86_64-DVD.iso image if one already has the Fedora-10-x86_64-DVD.iso image (either as an ISO file, or on DVD).  This requires the applydeltaiso command, contained in the deltarpm package (available in the Fedora repos).  Using the ISO file, one runs

applydeltaiso Fedora-10-x86_64-DVD.iso Fedora-10_11-x86_64-DVD.diso Fedora-11-x86_64-DVD.iso

If one has the DVD, just mount it and then run

applydeltaiso /dev/dvd Fedora-10_11-x86_64-DVD.diso Fedora-11-x86_64-DVD.iso

Before downloading the deltaiso, make sure to have the correct, verified, input image.  The SHA1 for Fedora-10-x86_64-DVD.iso is

f1e5ae7db6a1ba227de7294c4112385922388648 *Fedora-10-x86_64-DVD.iso

as found in the readily available signed SHA1SUM file.  If it's on DVD, one can simply do a mediacheck.  After running applydeltaiso, verify the output image.  The SHA256 for Fedora-11-x86_64-DVD.iso is

9f733ef43d470217a08dd3f4214deecccfc9e6d5041dc8eef47d990c419a6884 *Fedora-11-x86_64-DVD.iso

as found in the signed Fedora-11-x86_64-CHECKSUM file (use sha256sum to compute).