Lost permission to my external drive after : Debugger called : panic

Hi,
I run Snow Leopard. Yesterday, I installed a RAID array using an external disk. The result was that the external disk was connected but, it did not seem to work. I have many external disk and many partition on my boot disk. They are all protected with restricted permission. I have set permissions to read/write for me and staff and deny access to others.
Today, I had a major crash. On the screen was written "Debugger called : <panic>". After reinstalling Snow Leopard with my boot disk I had the message that <<System/Library/Extentions/LexarFilterScheme.kext >> was not properly installed. Finder wasn't able to show any window. Restarting Finder did not solve the problem.Then I installed Snow on my old RAID disk and boot with this disk. I was then able to run disk utility and uninstall the RAID array. This solved this problem.
But, now, I got a big problem. The permission of all my external disk and secondary partitions of my primary disk are now changed to Custom and there is no way I can access them anymore. I can do a check disk but I can't repair permission as they are not accessible.
If I click on dick folder, get info, sharing & permissions, enter password and changed my privelege from custom to read & write, when I close and reopen get info, permission as not changed.
Can anybody help me to get my data back?

See V.K.'s post in this thread: https://discussions.apple.com/message/11044944?messageID=11044944#11044944?messa geID=11044944

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