[blantonl]

Pretty clever on their part :)

It is actually pretty standard. Deduplication is a very common method for not duplicating the same content on shared storage.

[Joakal]

OT: How do you add italics to text? I find it preferable than adding >s.

[patrickk]

You may find these helpful, the formatting options for HN:

http://news.ycombinator.com/formatdoc

[edanm]

Put asterisks around the text: *your text (and another asterisk - can't put one or my text will be italicized!).