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Remove excessive layer filters with the FILTERS command (see How to delete layer filters in AutoCAD).Remove excessive annotation scales from the drawing with the SCALELISTEDIT command (see Warning: "This drawing contains a large number of annotation scales" when opening a file in AutoCAD).There're 2 cases of this problem: the 1st situation is the hard disk is damaged and cannot be read, which can only be repaired by a professional agency the 2nd situation is that the hard disk can still be recognized, but it cannot be read, written or used.
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If a drawing file will open, see Optimizing the AutoCAD drawing file: Purge, Audit & Recover. This software can repair and restore CDR files at a time without losing a single bit of data.Work through the following solutions as listed: Solution: Follow this troubleshooting guide "How to repair corrupt AutoCAD drawings".