Deltaiso from
Fedora 12 x86_64 DVD ISO sha256sum: c899659b8a7ceb8f005fc1a300b4e21c984a48fd7b8d8a332ed24bf8c3c479e8
to
Fedora Unity 20100303 12 x86_64 DVD ISO sha1sum: 35cb805eb5b58f28e2842099b47f3fafb2427573 - listed at http://spins.fedoraunity.org/Members/Southern_Gentleman/SHA1SUM/view
Fraction of full ISO size: 19.9% applydeltaiso's approximate running time (2-3 GHz CPU, 1-2 GiB RAM): 38 minutes md5sum of deltaiso: d90c343aaf38746250dc6cd7e4014569
Instructions at https://fedoraproject.org/wiki/Delta_ISOs
Verification issues:
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Fedora Unity still uses sha1sum, even though Fedora Project has used sha256sum since Fedora 11.
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Fedora Unity tends to erase from their website any traces of previous respins (including even the checksum files needed for verifying) when new respins come out. If you want to be able to verify in the future discs you currently have, keep a local copy of the checksum file. Even if you could find a copy of it online (unlikely), the fact that it's unsigned means there would be no way to verify it.