RAID Levels and why RAID10 is better than RAID01

RAID - Redundant Array of Independent Disks

About different raid levels, refer the following links to get an idea

http://www.fatmin.com/2010/04/raid-levels-explained-and-simplified.html

http://www.buzzle.com/articles/raid-levels-explained.html

Why RAID10 is better than RAID01?

RAID10 offers better fault-tolerance(redundancy) than RAID01.

This is illustrated in the below link

http://www.thegeekstuff.com/2011/10/raid10-vs-raid01/