No, I'm talking about parity raid (raidz1/z2/z3, or, more familiarly, raid 5 and 6).

In a raidz1, you save one of the n drives' worth of space to store parity data. As long as you don't lose that same piece of data on more than one drive, you can reconstruct it when it's brought back online.

And, since the odds of losing the same piece of data on more than one drive is much lower than the odds of losing any piece of data at all, it's safer. Upping it to two drives worth of data, and you can even suffer a complete drive failure, in addition to sporadic data loss.