[ThinkWriteMute]

You know this makes me think: If you could find out if two files are exactly alike, could you then make a cloud storage services that doesn't require uploads of files it already has on the entire cloud?

IE, John uploads True Blood Episode 4, Season 12.

Paul tries to upload the same file. They match exactly (Except maybe for names). The Uploader negates the upload and makes it look like the file is now in Paul's list, when really only one copy exists.

[jefffoster]

Some file systems have this as a built in option. As an example, there's a discussion of the ZFS implementation at http://blogs.sun.com/bonwick/entry/zfs_dedup.

[ThinkWriteMute]

Now that totally interests me. Thanks!