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Kernel panic - Cannot open root device error

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I have an older Unraid server which is running an older version of Unraid.  It had a disk that had failed.  So I stopped the array, unassigned the old disk, put in a new disk and powered on.

 

The system will not fully boot up.  Here is what I get on the monitor.  I get the same error when I put the old hard drive back in rather than the new drive.  The system is now quite a few years old as is the USB drive.  Anyone have a recommendation on how to fix.

 

UnraiderrorFeb2025.thumb.jpg.ae3770c3f7cc6b7f5e55b09f47863950.jpg

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From an old diag file I found that this system is running Unraid version 6.4.1

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Not necessarily a fix, but I restored an old flash drive backup and now it is working, with the new drive being rebuilt.

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