error codes

In what context? All we know is that you are using WinNT (because you posted in that section). Are you using the Workstation or server version? What device were you trying to access? What application(s) were you using at the time? What was the rest of the error message? What activity were you attempting when the error message appeared?

The only thing I could find directly relating to an error 0020 is in the MS Knowledge Base article 124379 - Err Msg: Tape Drive Has Been Detected But Driver Has Failed...
Look and see if that fits your situation?

Otherwise, please provide us with some more information.

Hope this helps.

I always recommend www.eventid.net for solutions to issues such as this. http://www.eventid.net/display.asp?eventid=0020&source=

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