What is the difference between RAID 10 and RAID 01?

What is the difference between RAID 10 and RAID 01?

1) What happens when a hard drive fails in each of them?

2) Which one is two RAID 1 arrays in RAID 0 and which is two RAID 0 arrays in RAID 1?

I read the sticky, but I am not quite getting it.
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  1. You might read this too...

    2) I didn't know there was actually a distinction, I thought you lumped 4 drives in there and let the controller do its thing.

    http://en.wikipedia.org/wiki/RAID_10#RAID_10_.28RAID_1.2B0.29
  2. Thanks for the link, now I get it.
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