Comment 1 for bug 1325786

It does what it says. When it said "all you data" you assumed it didn't mean that.

With that said, I had a conversation with somebody about this already, and I really agree on the fact that this is utterly confusing. To novice users the warning is explicit enough. To advanced users, there's obviously missing information as to what this option does to existing partitions and whether or not it deletes the entire OS (i.e. everything that's mounted via /target/etc/fstab) or simply the root partition itself.

We'll look into fixing that for the next release. In the meantime we'll update the release notes to let people know.