Abstract
This article introduces the concept of abad square in aredundant array of inexpensive disks (RAID). Bad squares are used to prove upper limits on the reliability of the2d-parity arrangement when there is the possibility that astring of disks may fail simultaneously. Bad-square analysis motivates several optimal string layouts which achieve these limits. Bad squares also provide a means to calculate the mean time to data loss for a RAID layout, without the use of Monte Carlo simulation.
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