The RAID technology is relatively mature now and applied widely in serverand even micro computer, but due to lack of experience in its application,even professional engineers feel at loss about the problems lisuchas, disk array information recovery when RAID corrupt, original data retaining when RAID corrupt for commixing disk's levels, when and how to resume lower version of BIOS of the disk array, why system down at time of mirror operation and how to solve it. The writer summaries solutions for 4 typical cases based on his experience in relevant work, to provide reference for readers that have similar problems, in the hope of helping them recovery the disk array fast.