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CAD Repair.DWG

How to Recover Corrupted AutoCAD DWG Drawings

Common Symptoms

  • AutoCAD error: "Drawing file is not valid"
  • Fatal Error: Unhandled Access Violation when opening blueprint
  • Drawing opens with missing blocks, layers, or corrupted objects
  • Proxy objects display incorrectly or prevent editing
  • Hatches, external references, or annotation scales are missing
  • The drawing opens only after repeated audit prompts

Root Causes

  • AutoCAD crash during DWG write operation
  • Network share disconnect while drawing was locked
  • Version mismatch between AutoCAD 2024 and older DWG format structures
  • Unresolved proxy objects from an unavailable vertical product
  • Drawing database errors accumulated after repeated saves
  • A network or synchronization tool created a partial file

Step-by-Step Repair Methods

Method 1: AutoCAD RECOVER & RECOVERALL Commands

Intermediate

Launch AutoCAD, type RECOVER in command bar, select damaged DWG file. AutoCAD will audit and rebuild object drawing tables.

Method 2: Import Drawing as External Reference (XREF)

Intermediate

Create a fresh blank DWG drawing file, type XREF command, and attach broken .dwg as overlay block to extract geometry.

Method 3: Run AUDIT and PURGE on a copy

Intermediate

After opening a duplicate, run AUDIT to repair database errors and PURGE to remove unused objects. Review the command log and save to a new filename.

Method 4: Recover from a BAK or SV$ file

Easy

Compare the drawing with its .bak or autosave .sv$ copy. Rename only a verified backup copy to .dwg and retain the original evidence.

Method 5: Export readable geometry

Advanced

If the drawing opens partially, export or copy healthy layers into a new drawing and document which objects could not be recovered.

Preventive Best Practices

  • Set SAVETIME in AutoCAD to automatic 5-minute interval backups.
  • Store drawing files on local SSD drive rather than raw network drives during editing.
  • Keep DWG backups outside the active network synchronization folder.
  • Use the correct DWG version for collaborators and audit drawings before issuing them.
  • Package XREFs, fonts, plot styles, and custom objects with the drawing.

Preguntas frecuentes

Respuestas claras a las preguntas más habituales.

Look in C:\Users\[User]\AppData\Local\Temp for files ending in .sv$ or same directory as drawing for .bak files.