Take a look at the Thread #600557 for discussion on this topic.

>I have a dbf which open in share mode and buffered optimize. Well the code is like this.
>
>Use File.dbf Share
>Cursorsetprop('Buffering', 5, File')
>
>the problem Invalid Buffdirty call accured if the server goes down due to power failure.
>
>Some of the record in File.dbf is missing and it only can be shown if i lock the file, but the value of the missing record is not meaningful.
>
>I wonder if anybody can help me to avoid this error and also to fix the corrupted file.
>
>Thank's